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When the final (non-security) pin is set, the lock should open. Most wafer locks are made to very loose tolerances and have relatively open keyways, however, and are very easy to pick. Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. Very "wavy" rake picks can simulate various key profiles, and can be surprisingly successful at opening poorly-made locks. In a lock with six pin stacks with a uniform chance of a pin setting at either shear line, the probability of a picked lock actually opening is only 1/64. Picking techniques for these locks involve the use of special torque tools designed to put torque on only one of the two concentric plugs. The multiple peaks allow several, or even all, pin stacks to set simultaneously. The least common multiple of and , written as , is the smallest natural number that is a multiple of both and .

If the breaker fails to make a successful break-usually defined as at least four balls hitting cushions or an object ball being pocketed-then the opponent can opt either to play from the current position or to call for a re-rack and either re-break or have the original breaker repeat the break. Tubular cylinders typically have four to eight pin tumblers arranged in a circular pattern around the circumference of the plug. Most automotive locks use wafer tumblers. Many inexpensive locks, especially low-security "cam" locks such as those used to secure furniture and cabinets, do not use pin stacks for their tumblers. Pin stacks with partially set spool and mushrooms, on the other hand, will feel a bit different. The name comes from the resemblance to an empty spool of thread. Picking locks with spool and mushroom pins takes practice, both to recognize them and to effectively neutralize them when they are encountered.

You may well have one of these locks on your house. Though we may not be able to predict exactly how a chaotic system will behave moment to moment, knowing the attractor allows us to narrow down the possibilities. It also allows us to accurately predict how the system will respond if it is jolted off its attractor. With practice, even this keyway will eventually seem easy to maneuver. Once you've mastered the AR1 keyway locks, repeat exercises 2 through 6 with the "Ilco SX" keyway locks. Their security ranges from being quite rudimentary to being among the most formidable locks in commercial use. Mechanical combination locks are common on inexpensive padlocks, safe locks, and to control access to high security vaults. However, some tubular cylinders (e.g. the Ace-II lock and the tubular models of American-brand padlocks) are made to very tight tolerances and use mushroom, spool, and serrated security pins. Each red ball when pocketed remains in the pocket, while the colours when pocketed, as long as any reds remain on the table, are placed on their respective spots. The player must first pocket a red ball and then try to pocket any colour he may choose, scoring the value of the ball that he has pocketed.

When you're comfortable picking the three pin lock (in both directions) move on to a fourth pin, and when you've mastered that, a fifth and then a sixth. Scaling up the picture from the previous example by a factor of 3 then gives us this picture. While applying light to moderate torque, push and pull a gently rounded rake pick from front to back and back to front along the pin stacks. The origins of billiards date back to the 15th century in Europe. A common door lock mechanism in Europe uses a standardized "European profile" lock module. If not successful, invert the pick and try again with the inverted profile. In fact, master keyed pin stacks are easier to pick than those that are single-keyed; there are two chances to lift a cut to the shear line. The pin stacks with regular pins will feel just as you'd expect, with a hard stop when the bottom pin hits the shear line. For example, Medeco locks use special wedge-shaped bottom pins that are rotated into one of several possible positions by the key cuts (which can be cut at different angles).

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