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If the shear line is within this gap as torque is applied, it may set. When the energy transfers, the top pin moves up while the bottom pin slows down, and a gap is created between the two pins. If the wafer is set too low by the key, it blocks rotation by extending out through the bottom of the plug, while if it is set too high, what is billiards it extends out the top. Preceding to donning the product, as in low visibility polluted h2o diving wherever you can't see some thing as you move by indicates of pea-soup h2o, I visualized the controls so I could "see" them in my mind's eye and uncover them without having the need of needing to stop my work out schedule and look at off the goggles to in reality see them. When inserted quickly in and out of the keyway and rubbed along the bottoms of the pins, they tend to make each pin stack "jump" rapidly. To determine which pin stacks have these pins, gently push up each "set" pin.

As the peaks hit the pin stacks, energy is transferred from the bottom pins to the top pins, much like the action of the cue ball in billiards. Figure 6. Abus "spool" top pin. Pin stacks with partially set spool and mushrooms, on the other hand, will feel a bit different. The first sign of spool and mushroom pins is that the lock will appear to be picked, but will only turn a few degrees. Picking locks with spool and mushroom pins takes practice, both to recognize them and to effectively neutralize them when they are encountered. The name comes from the resemblance to an empty spool of thread. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. A variety of schemes are used to key the sidebar. 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).

A few pin tumbler lock products orient the key horizontally in the keyway and use a flat key bitted with variable-depth holes ("dimples") rather than the cuts used for the familiar "sawtooth" key. Most pin tumbler cylinders can be "master keyed" to allow more than one key bitting to operate it. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. SFIC cylinders (such as those made by Best), used in large institutional lock systems, employ a similar mechanism to provide two kinds of keys: regular keys that operate the lock and control keys that unlock and remove the cylinder core itself. 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. 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.

In addition to making picking more difficult, secondary locking mechanisms are sometimes also intended to make it more difficult to reproduce unauthorized copies of keys. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. However, note that because the tumblers are a single piece, sawtooth raking, snap guns, and bump keys are not effective against them. If serrated bottom pins are used as well (as they are in, e.g., certain American brand padlocks), snap guns, bump keys, or sawtooth raking are likely the only picking techniques that will succeed, especially for the novice. When the pin stack truly sets at the shear line, it will feel like an ordinary set pin. 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.