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Many of the principles can be applied to other keyed lock types, although sometimes the techniques and tools must be adapted. It is aimed at locksmith practitioners but has a cogent discussion of principles as well as technique. Indeed, security system software may well be considerably worse, since it is often purpose-written and may be subject to only limited scrutiny and testing. However, because the precision with which locks can be manufactured is limited by physical processes, materials, economics, and usability considerations, exploitable weaknesses almost always exist in practice. Ilco replacement cylinders are inexpensive and a good compromise between quality and pick-ability for practice (that's what the training locks here are) and are available in a many different commonly-used keyways. Here the plug has been turned slightly toward the camera, so that the tops of the pins in the plug are visible. While some of these features can be defeated with conventional picking tools and are covered here, picking high security locks generally requires specialized tools and techniques (often designed for a specific brand or model of lock) and are beyond our scope here. You may find one of the smaller LAB hook picks to be easier here than the larger Peterson picks, although you can usually still pick this keyway with the small Peterson hook.

Find the board with the six "Arrow AR1" keyway locks. Go back to the "Arrow AR1" keyway lock board and find the one pin lock. If you can find a copy for sale, get it. The player can win a frame by scoring the most points by pocketing the red and colored balls with the cue ball. Some players will purchase spot stickers and use them to mark out where the colored balls should go. Straight pool is a ‘call-pocket’ game, which means that before shooting, players must say which ball will go in which pocket. Sometimes, people call Pool pocket Billiards. It's hard to learn these skills all at once on off-the-shelf commercial locks, but that's what many people who try to learn lock picking end up doing (before giving up in frustration). Spend more time on this exercise than you think you need to; most people never learn to properly apply the light touch needed to pick better quality locks. See Figures 3 and 4. Once you're comfortable with the AR1 keyway, move on to the "Ilco SX" keyway locks and repeat the exercise. See Figure 5. With the tool in the keyway, apply torque and try to turn the plug.

Figure 2. Pin tumbler lock with a correct key inserted. Figure 1. A pin tumbler lock cylinder. See Figure 1. (In practice, the cuts are produced by stacking pin segments of particular lengths, not by actually cutting the pins; hence the term "pin stack.") With no key in the lock, all the pin stack cuts rest within the plug. In this document. we focus specifically on the conventional "pin tumbler" lock, which is the most common commercial and residential design used in the United States. The selection of the torque tool is just as important as that of the pick, but, again, commercial pick kits often fail to include a sufficient range of sizes and designs to allow good control and feel across the range of common locks. The principles and skills of lock picking, once mastered, can be applied against the vast majority of commercial pin tumbler locks, and the basic tools, if somewhat unusual, are quite simple. Worse, they often omit the designs that are of the most practical value. For those unfortunate neo-anti-Luddites who refuse to acknowledge the value of anything not available on the Web, I suggest, at a minimum, reading the MIT Guide to Lockpicking, which, while not perfect, has the virtue of being free (and readily available online).

Lock picking is a core skill of the locksmithing trade and is also of value to those evaluating, investigating, and studying security systems. Much of lock picking skill depends on testing pins stacks for the purpose of finding which to push up next and assuring that no pins are overset. Success in lock picking is mostly a matter of skill. There has been quite a bit written, on the Internet and in print, about lock picking. If this pin stack is slowly pushed up with torque applied to the plug, eventually its cut will reach the shear line and the plug will turn a bit more. The top pin of that pin stack will be trapped above the shear line, the bottom pin will fall freely, and now a new pin stack (the next most misaligned one) prevents further rotation. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug.

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