Repeat until lock turns: - Locate the pin stack that's being pinched at the shear line (it resists slightly when pushed up) - Continue to push that pin stack up until its cut reaches the shear line and the plug turns slightly. While this might have gotten the lock open, you just as easily might have pushed the cut past the shear line entirely, preventing the lock from opening altogether. Because there are two independent shear lines, there is no way to control, or even tell, at which shear line a given pin stack sets. The phenolic resin, a thermosetting plastic, is a variation of Bakelite that uses even more extreme pressure to form the balls. Billiard balls made from polyester resin are generally more affordable. For most of the picking methods discussed here, in which tumblers are manipulated one by one, a "hook"-style pick is generally used. 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.

Left: The correct key lifts the pin stacks to align the cuts at the shear line. These imperfections are very small -- as little as .0001 inches in some cases -- but they are what allow us to manipulate ("pick") locks open without using the correct key. 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 proper pick and torque tool selection depend on the shape of the keyway, the features of the lock, the picking technique, and the individual preferences of the user. Both the pick and the torque tool also amplify and transmit feedback about the state of the lock back to their user. Other names for the torque tool are turning tool, torque wrench, torsion wrench, and tension wrench. Continue with the one pin lock, trying to apply less and less torque each time. 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 pick must be strong enough to resist bending or breaking while lifting pins, yet the shaft must be small and thin enough to maneuver freely around the keyway without disturbing other pins. Pool Cues: Pool cues are heavier (18-21 ounces) and shorter (57-58 inches) compared to snooker cues, with a thicker shaft and a larger tip diameter (12.75-13.25mm). This construction provides the necessary power and control for maneuvering the larger, heavier balls used in various pool games like Eight-ball and Nine-ball. Longer handles are as a rule better in torque tools; the farther from the plug the torque can be applied, the easier it is to detect and control fine movement. If the torque tool is too thin, it will tend to be "springy" and will absorb much of the fine movement and control needed to successfully pick better quality locks. 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.

In the lab there is a collection of "training locks," mounted on boards, for practice. There is a tradeoff, of course, since a longer handle may be difficult to maneuver around obstacles. Other differences between picks, aside from the shape of the tip, are the material, finish, width and thickness of the tang shaft, and the shape and material of the handle. Professional billiards tables are often larger than pool tables. The objective of a billiards game is to score a fixed amount of points, or to score the highest number of points within a set time limit that is agreed upon at the beginning of the game. From, this the game was then linked to poolrooms and gamblers. Familiarize yourself with the standard billiards table dimensions and how to set up the balls properly before every game. The 15 red balls are placed in a triangle towards the edge of the table. You cannot pocket red balls continuously. In Pool, the number of balls in a full set of pool balls varies depending on the type of the game, but a full set includes sixteen balls, each 2 1/4 inches in diameter: eight solid color balls numbered one to eight, seven balls with a color stripe numbered nine to fifteen, and a solid white ‘cue’ ball.

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