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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. Picking locks requires skill, practice, and the use of rather unusual (and not widely available) tools. For extra fun, use red and black magic markers to turn the tennis balls into eyeballs. When attempting a combo shot, what is billiards carefully assess the positioning and alignment of both balls involved in the combination. 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. When a key is inserted into the keyway slot at the front of the plug, the pin stacks are raised within the plug and shell. The basic design consists of a rotatable cylinder tube, called the plug, linked to the underlying locking mechanism. 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.

Here the plug has been turned slightly toward the camera, so that the tops of the pins in the plug are visible. The basic algorithm for picking locks is remarkably simple: - Apply a small amount of torque to the plug. What is Lock Picking? Lock picking is useful and worth studying for its generality and simplicity. From the attacker's perspective, too, lock picking is rarely the most efficient, most economical, fastest, or easiest method of entry. Few burglars can afford to risk exposure during the time required to pick even relatively easy locks, and unexplained possession of lock picking tools is often considered prima facia evidence of criminal intent. 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. 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. Surreptitious entry (e.g., for espionage or law enforcement surveillance) is likewise often best accomplished by obtaining a key or through the use of specialized decoding or bypass tools designed to quickly and quietly defeat the locks used by the target.

Drill a 1-3/8 inch hole and use the mounting hardware supplied with the cylinder. While the pin tumbler cylinder is by far the most popular door locking mechanism in the United States, it is not the only kind of keyed lock in common use. And of course there is the surest and fastest method of all: the use of the correct key. Figure 2. Pin tumbler lock with a correct key inserted. Figure 1. A pin tumbler lock cylinder. 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. 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.

Pin tumbler lock picking consists of raising the cuts on each pin stack to the shear line, one by one, until the plug turns freely. Note the border between the plug and shell, which forms the shear line, and the cuts in each pin stack resting within the plug. Picks probe and lift the individual pin tumblers through the keyway, while torque tools control the degree and force of plug rotation. It is usually possible to insert the torque tool at either the top or bottom part of the keyway. Once you've mastered the AR1 keyway locks, repeat exercises 2 through 6 with the "Ilco SX" keyway locks. These are typically pin tumbler locks, but their orientation is "upside down" with respect to the convention for locks installed in the United States. The answer boils down to this: almost everything. What change in policy could make some Google employees break down in tears? Become comfortable with this before you try picking this lock with torque or you could bend or break your picks.