Blog Archives

EDC for Kids updated

I’ve updated my EDC for Kids post with input and feedback I’ve received from folks.

Thanx, y’all!

Why I carry on both sides

Via Unc, a discussion of carrying a folding knife on the weak-hand side.

He lists very good reasons for carrying that way, but I say why limit yourself to one side or the other?

Carry both.

I carry two Spyderco Delicas, one clipped inside of each front pants pocket. They are set up in the same way, tip-up carry, clip on the same side. Not sure how to describe which side and orientation the clip has, so here’s a picture:

Of course, the only picture I have doesn’t show the clips but…they are on the other side of the body, with the clip fastened to the bottom end…. so when closed, the blade tip and clip “screws” meet. Allows tip-up carry. You can figure it out. :-)

And then, one into each pocket.

What this allows is access to a blade by either hand, either side. And to work the knife is consistent for each hand. So if the right hand gets the knife on the right side, it’s a simple motion to open the knife. If the right hand reaches for the left knife, the orientation remains the same and opens the same. The left hand only requires a small rotation of the knife in the hand, but it’s the same rotation regardless of knife.

This way, I have no limits. Any hand, any side, any blade.

For those that carry only one knife on one side (either side), what if you can’t get to that side when you need your knife? What will you do?

You can also argue the “2 is 1, 1 is none” angle. Of course, I have 3 if you count the Leatherman.

To me, these are useful everyday tools. Heck, I used my Leatherman Wave’s wire cutters a few days ago to trim a couple stray branches off our barbados cherry bushes where they were overhanging into the sidewalk. I use the Delica’s every day for things like opening letters. I know some say if it’s a knife for fighting you shouldn’t use it, keep it clean, sharp, ready. I say, I can clean and sharpen my knife, and every time I take the knife out to use it to open a letter that’s another repetition at drawing and opening to keep me in practice.

To carry two comes from Insights Training Center and their Defensive Folding Knife class.

Flashlight blogging – Fenix LD15

In our “bug out bag” prep, a natural thing to want to have is a flashlight.

I settled on the Fenix LD15.

Why?

  • I went with Fenix because they have a good reputation. No, it’s not a SureFire nor a Streamlight, but they use the Cree LED’s and Fenix gives you about the best bang-for-your-buck these days. Since I’m making BOB’s for 5 people, cost is a large consideration: I just can’t afford 5 SureFire’s and all the other “5′s of things” that will be needed for all the bags.
  • Size/weight. I’m no guru at making BOB’s, but my thinking is having an “essentials bag” (in addition to some other bags). This is THE bag you grab if you can’t grab anything else, so it needs to hold all the essentials. IMHO, a flashlight is an essential. Leaning back to my backpacking days in Boy Scouts, size/weight of everything matters… a cubic inch saved here, an ounce saved there, it all adds up. So I wanted something on the smaller side. The LD15 isn’t much larger than a AA battery.
  • AA battery. I hum-hawed for a while about what sort of battery to deal with. I admit bias towards the CR123′s because the LONG shelf life, which I think is important for a BOB since you have no idea when you’ll need things. Plus they are a good power source. However, they aren’t as common; a good grocery/drugstore might have them, but compared to AA’s? What is more ubiquitous than AA? So if things go really pear-shaped and resources are hard to come by, AA’s have the best chance of being found (in stores, in trade with other people, etc.). Furthermore, it’s likely there will be other things in my bag that need batteries, so being able to standardize on something is good, and AA’s should fill the bill. Fenix is all about the AA.
    • I did look into things in terms of storage life. Quality AA alkalines or even AA lithiums should hold charge and be workable. A BOB can’t be made then shoved in the closet and ignored, you need to go through it at least once a year for any food or medical or whatever stuff. So, batteries are just part of that. IMHO, get some high quality ones, then eventually rotate them out and put fresh ones in the bag and use the old ones in the Wii remote, the TV remotes, and other such non-important things. No big deal.

That was my thinking really before I did much shopping and product investigation. My wonder was if Fenix would have something that worked for me. Would there be enough lumens? Could I get dual mode, for high output but also very low so I could do things like read and not blind myself? Will it last long enough (at least on the low setting, I accept high will drain it quickly)? And so on.

I believe I saw LA Police Gear selling the E11 on clearance, so I Googled for more information. That actually seemed like it might fit the bill, but many were comparing it to the LD15, so well… sure the E11 is cheaper (see point 1 above), but if the LD15 offers something more, go for it.

Obviously, I opted for the LD15 over the E11. A few reasons:

  • The E11′s low setting was reported as actually kinda high (in terms of lumens/brightness). I can’t find reference to it now, but some people reported thinking it was too high. I don’t need that. Even my SureFire EL2 on low can be a little blinding if it reflects on what I’m reading just right.
  • The E11′s switch is a tailcap clicker, which is acceptable to me. But the LD15 has a flat base so you can stand it upright like a candle. I thought that might be useful in the given context.

I did look at the rest of Fenix’s offerings. They have a lot of compelling flashlights that I think are good for EDC (Every Day Carry), such as on your keychain (I think the E15 could make the perfect keychain flashlight. I was rather impressed and think Fenix is a great way to introduce people to the world of better flashlights: performance is good, price is low.  But nothing else really seemed to fit the bill as nice as the LD15 would. Remember, I’m buying for a specific context and reason.

I think the LD15′s high setting is bright enough, I think the low setting is dim enough tho still quite usable. I don’t mind that the on-off function is performed by twisting the cap — I would NOT want such a thing on a tactical light, but it’s fine here. In fact, any light I’d have in my BOB would have to be able to be disabled by twisting the cap off enough so that the light cannot be activated while sitting in the bag — and leaving me with a dead light. So, twist cap is not a problem at all.

The one thing I wish for is a clip, like on my SureFire E2L, so you could clip the flashlight onto something like a hat brim so you can direct the light where you’re looking and have both hands free. At least the LD15 comes with a basic lanyard.

Here’s a picture of comparison:

On the left, the SureFire E2L Outdoorsman: uses 2 CR123′s, 60 lumens max, 3 lumens low, LED-based, has a clip so you can hang it off things like a hat brim, costs around $185 these days. It’s my EDC flashlight and has proven to be most useful both for tactical needs and the normal every day needs that life brings. Happy investment.

In the middle, the Fenix LD15. And then on the right, a AA battery, for size/scale comparison.

So you can see, the LD15 is only slightly bigger than the AA: just wider because of the thickness of the case, and just longer because of the small tailcap and of course the LED housing.

How about performance? Quite good! I compared it to the E2L and was quite impressed with the light output. On high, the listed lumens of course put the LD15 as brighter, but practically speaking it doesn’t seem “twice as bright”. What was more noticeable was that the beam was wider, not as focused as the E2L. It’s not some floodlight, just not quite as “honed” as the E2L. Frankly, I think that’s acceptable for my context because I’m not wanting this flashlight to necessarily blind someone, I want this light for seeing as much as I can because life went pear-shaped. On low, you could really see how that sort of “beam focus” was useful, because it cast a more widespread light. You put it in low, stand it up on the tailcap like a candle, and we could light up a bedroom with a nice dim glow… enough to see everyone’s faces and what we were doing. Youngest even asked if he could have it as a nightlight. I also thought the low setting was certainly low enough and diffused enough that I could read by.

Truly, I’m impressed to get such performance out of a small package. I don’t know what runtime will be like with something like a quality alkaline or lithium battery will be. Fenix advertises high as 117 lumens for 1 hour 40 minutes, and low as 8 lumens for 39 hours, tested with a 2500mAh Ni-MH battery. They do recommend using a Ni-MH battery for best results, so I am curious how a quality alkaline will perform. Nevertheless, I think it will be suitable for the need.

All in all, I’m pleased with the purchase. I personally wouldn’t use the LD15 as my EDC flashlight, but that’s because my EDC needs are different. I do think this makes a good keychain flashlight for folks that may just want/need a light for those times when they need to manage something quickly in the dark. I also think it will fit the bill for the BOB: small, lightweight, dual modes and each mode is at a very useful level, flat tailcap to stand it like a candle, AA battery, inexpensive (relatively speaking).

EDC blades

Inspired by this post over at The Packing Rat, here are my EDC (Every Day Carry) blades:

The leftmost is a Leatherman Wave which is certainly the most action-packed of the EDC blades… because it’s more than just a blade. In fact, I use it more for the non-blade tools than the blade. But certainly if I want a saw or a serrated edge, that’s what I go for.

The other two are Spyderco Delica‘s. Yes, I carry two of them, one in each front pant pocket, both tip-up. This is a training artifact from an Insights Training Center Defensive Folding Knife class. You don’t think you need two knives until you can’t get to the one you need….  I like plain blades because it gets the job done just fine, and honestly it makes the knife less scary to grass-eaters. I also like the simplicity of the Delica… small enough in the hand so it’s not something to fumble or difficult to manipulate, but big enough to handle most chores. The large thumbhole is very easy to operate, even under pressure. It’s very sturdy. Holds a good edge. And if it gets lost or breaks, it’s not too expensive to cry over and easy enough to replace. The only trouble I keep having is the clips keep catching on various things that I brush up against so I’m always having to fix the clip (#6 torx bit is your friend). At least the clips are metal so it’s easy to bend back into shape with even a little overbend for better holding power.

One thing I often hear from folks is to not use your “self-defense” knives for anything else. Uh… why not? You should use it for everything. Need to open a letter? Use it. Need to open a box? Use it. Need to cut something? Use it. Or like Derek at TPR, “I’ve cracked open crabs, gutted fish, open beer bottles, cut tinder, start fires, etc.”  It’s a tool, use the tool. The more you use it, the adept you get at manipulating it, drawing it, opening it, and having it feel comfortable and usable in your hands. So the blade gets dull…. sharpen it!

Knives are useful tools. Oldest has a pocket knife but despite my constant prodding for him to carry it he won’t. Daughter adopted my old Leatherman Micra and did carry it around some but lost it. I figure a replacement will come eventually. Youngest, he needs to gain more confidence in using a knife first. But we’ll get there. :-)  Hrm… maybe a Delica or a smaller Leatherman for Christmas stocking stuffers…. hrm…. :-)

Leatherman MUT

I love my Leatherman Wave. One of the handiest tools I have, and I carry with my always.

I see Leatherman has come out with a new product, the Leatherman MUT. (h/t Uncle)

Here’s a link to their PDF brochure.

I don’t think I’d use this as my EDC, but in the range bag or taking with me (in addition to the Wave) into the field? It could be useful.

And just for the TXGunGeek I have this little quote from the brochure:

The MUT comes with a wrench accessory that features 1/2” and 3/8” 12-point heads for adjustment to optics systems. Built to military performance specifications, the ballistic nylon MOLLE sheath features extra wrench and bit kit accessory pockets. When not in use the sheath can hold a double-stack 9mm clip.

Clip. *sigh*

Cuttin’ stuff

People keep wondering, why carry a knife.

This morning is a perfect example.

I had to cut open 2 bundles of furring strips, a package of weatherstripping, then cut the weatherstripping to length to go on the door.

It was sure nice to have an appropriate tool on hand, sharp, ready to go, able to be easily retrieved when needed and stowed when not (pocket clip) but yet handy at all times.

And all before 9:00 AM.

I know this isn’t glamorous, but it’s a tool…. it’s just about being handy and useful. Tools are most useful and most handy when they are available and ready to go when you need them.

Streamlight NightFighter Review

This is a quickie review of the Streamlight NightFighter.

I received this flashlight as a Christmas gift from my brother-in-law.

It’s my first Streamlight. My other “serious” flashlights are a SureFire E2L (which I always carry) and a SureFire 6P LED Defender.

Read the rest of this entry

Thank God for my Leatherman Wave

Ah…. Christmas morning.

The sounds of children tearing into wrapping paper as they open their gifts.

That’s the easy part.

The hard part is Dad having to tear through all the packaging to actually extract the toy. :)

I am so thankful for my Leatherman Wave. Knives for cutting out packaging. Pliers and wire cutters for removing those !*%@ing twist tie-downs. Screwdrivers to open and close battery compartments.

For my Leatherman Wave, I am thankful. :)

Merry Christmas, y’all.

Code Practices

I’ve been developing software over 30 years, 15 of those professionally. I’ve learned a thing or two from the real-world trenches, one of which is that all code written must eventually be maintained… probably by you. The more you can do to ensure your code can be understood 6 months (or more) later, the better (your) life will be.

But this is hard.

Not just whining that it’s hard, but it is a difficult thing to do because who can know what exactly you’ll need to know or care about during maintenance. And while you’re in the heat of the moment writing code, you may not consider everything that needs to be documented. This is why the best you can do is strive to write simple code, well-factored, and as understandable as possible from the get-go. Premature optimization is the root of all evil. Simple is good; simple is best.

Via Slashdot I see this article on Coding Practices. He raises good points, but at least in my experience it doesn’t always work out that way.

Read the rest of this entry

Better than setuid – BetterAuthorizationSample

While scanning my RSS feeds I ran into this post from JongAm. It’s in Korean so I really don’t know what he’s talking about specifically, but generally I can tell he’s writing about Mac OS X’s authorization mechanisms. (BTW, I love that URL’s and such don’t choke on Hangul).

There’s something at work I’ve been fiddling with the past some days. The issue is that something has to be done and that something requires authorization. Unfortunately, due to how things can work under the hood by the drivers and the OS interacting, it’s possible things could change and thus require the user to authenticate again. This is not a desirable user experience because the need to re-authorize is an under-the-hood detail, not something the user would be aware of. Thus to the user the user experience is randomly, or not, being asked to reauthenticate. Not good.

So what’s the solution? The original thought was to create a little helper tool app that would have its setuid bit set and be installed as root, thus the user would have to authenticate at most one time and the little helper tool would then be authorized “forever” to do the necessary voodoo. A reasonable thing. And setuid tools are not a new concept and are well-established, but still they’re considered tricky and risky because you’re still running code as root which opens up all manner of security issues.

As I searched around for information, I came across Apple’s BetterAuthorizationSample. Obviously written by Quinn (thus you know it will rock), it’s provided as a way to achieve the same results as a setuid tool but in a safer way by use of launchd. What’s even better is BAS provides a library and mechanism to make it easy for you to utilize this functionality in your own code. There is step-by-step documentation that walks you through the whole process, and of course a sample app to demonstrate various levels of complexity. For more information, read the ReadMe, the Design and Implementation Rationale, and the lib HOWTO.

Getting it up and running in my app wasn’t too difficult a task. Just follow the HOWTO guide. It does take a little bit to wrap your head around it all just because there’s a lot going on, but the documentation is thorough and complete. Just do as it says and you’ll be up and running. Works great in my app. I’m pleased.

I will note that if you don’t have an uninstaller for your application, this is one situation that might find a simple uninstaller to be a welcome thing. There are not only files in odd places to remove, but also you will need to unload the Launch Agent from launchd. There’s also the question of removing the entry in /etc/authorization but there’s really no good way to do that. Still, something you need to consider.

All in all a fantastic bit of sample code, and while not necessary for all authorization needs, if you are considering writing a setuid tool for Mac OS X, you should look at this mechanism instead.

Good stuff. Share and enjoy.

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