Breaking down the Basics: Essential Shots every 8 Pool Player should Know > 자유게시판

This keyway is common in commercial and residential locks in the US, and is close in shape and size to a number of other common keyways, including that used by Kwikset, a very popular (and easily defeated) line of US residential locks. Some pin tumbler locks incorporate "high security" features, including secondary locking mechanisms and features intended specifically to frustrate picking. This may be a consequence of more stringent European insurance standards for physical security. Each pin stack is cut in one or more places perpendicular to its length. Regardless of the initial direction, after passing through one focus, the billiard ball reflects off the ellipse and passes through the other focus. Few details are known other than wooden mallets are used to strike a boxwood ball that is about 12 inches in circumference toward a predetermined target marked on the ground. Spring steel or stainless steel, between .020 and .035 inches thick, are typical materials. Several positions are possible; here a vertically-oriented torque tool is used at the top of the keyway. This can involve hiding their target balls behind other balls or placing them in tricky positions where they have limited options for pocketing them. Traditional green is widely used, but there are other color options available to suit personal preferences.

In the lab there is a collection of "training locks," mounted on boards, for practice. Like any skill, improvement in billiards comes with practice. There are numerous varieties of each game-particularly of carom and pocket billiards. Everything will still be there tomorrow. If you release pressure with your pick while still applying torque, the bottom pin will drop freely, and will not have any spring pressure if you try to push it back up. 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. Another style of torque tool has two "prongs" that fit in the top and bottom of the keyway, with a cutout between them for the pick. A functional pick kit should contain several different size hooks to accommodate a range of different keyway shapes.

The traditional torque tool is made from stiff, flat spring steel, bent at a 90 degree angle to provide a small blade that fits in the keyway and a long handle to which torque is applied. Instead, they use flat "wafers," typically extending across the full height of the plug. Rotation of the plug within the shell operates the locking mechanism. In particular note that because the pins are slightly out of alignment, as the plug is turned gently, only the pin stack that is most out of alignment actually prevents further rotation. 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. The top pin of the most misaligned pin stack becomes "pinched" at the shear line between the plug and the shell. Picking tools are designed to perform one of two basic functions: manipulating pins and turning the plug. The basic recommended pick set for this course includes four picks and four torque tools. The pick design it calls a "rake" is called a "hook" by the rest of the world (it's the kind of pick you'll be using most).

For example, the method it calls "scrubbing" is called "raking" by almost everyone else (it's not something I suggest you spend much time on, at least at first, by the way). If you’re familiar with Fermat’s principle of least time, then you can directly apply it here but with a billiard ball instead of light rays. A good rule of thumb is to be able to complete an exercise at least ten times clockwise and then another ten times counterclockwise before considering it complete and moving on. Good tools are important, to be sure, but once a few basic tools are available the student of lock picking is usually better off investing in new locks on which to practice rather than in new picking tools. The tool must have a good fit to be effective, however. The tool should amplify, not dampen, the rotation of the plug. Right: With all of the cuts at the shear line, the plug can rotate freely within the shell. It moves freely up until it reaches the shear line, where it "hits a wall" and can move no further. It is very important when you do the exercises that you not move on to the next until you have completely and comfortably mastered the exercise you're working on.

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