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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 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). The basic design consists of a rotatable cylinder tube, called the plug, linked to the underlying locking mechanism. When a key is inserted into the keyway slot at the front of the plug, Billiards Guide the pin stacks are raised within the plug and shell. Left: Cylinder face, the lock's "user interface." Note the keyway, which is cut into the plug, which in turn sits inside the shell. Each pin stack is cut in one or more places perpendicular to its length. Figure 1. A pin tumbler lock cylinder. 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.

Mechanical combination locks are common on inexpensive padlocks, safe locks, and to control access to high security vaults. 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. Other classes of attack, not discussed here but at least as worthy of study and scrutiny, include lock decoding, which is concerned with producing a working key based only on access to the external interface of the lock, lock bypass, which aims to unlatch the underlying locking mechanism without operating the lock at all, and forced entry, which, as the term suggests, involves the destructive application of force to the lock or its surroundings. Keep practicing with the two pin lock, trying to lighten your touch as you do, and making sure you consistently can pick the pins one at a time. Unfortunately, many of the commercially available lock pick kits consist mostly of useless gimmicks. The height (or cut depth) of a key under each pin stack position is called its bitting; the bitting of a key is the "secret" needed to open a lock.

Right: Side view, with part of the shell and plug cut away to expose the six pin stacks. Children between the ages of six and 11 inclusively are permitted on this tour at the rate listed above. Typical commercial and residential locks have five or six pin stacks (although four and seven aren't unheard of), with from four to ten distinct cut depths used on each. See Figure 2. The plug will be blocked from rotating if any pin stack is lifted either not far enough (with the cut still in the plug below the shear line) or too far (with the cut pushed above the shear line and into the shell); to rotate, all pin stacks must have a cut at the shear line. Every drop pocket of the pool table and every ball must be wrapped in packing paper. Moving a pool table is not a joke. If you love the game of pool, you may want to invest in your own cue stick and maybe even your own pool table. Tis game was clearly Whist in an imperfect form.

One effect of Hoyle’s publication was to draw forth a witty skit, entitled "The Humors of Whist. A key that is bitted to the wrong depth in even one pin position will not operate the lock. Figure 2. Pin tumbler lock with a correct key inserted. 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. In an ideal lock, all of the pin holes in the plug would be in perfect alignment with the corresponding holes in the shell, the centerline of the plug would be exactly parallel to that of the shell, and all of the pins would be exactly the same diameter. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. The modern pin tumbler lock is quite simple, dating back to ancient Egypt but not commercially mass-produced until the middle of the 19th century. Some pin tumbler locks incorporate "high security" features, including secondary locking mechanisms and features intended specifically to frustrate picking.