Breaking down the Basics: Essential Shots every 8 Pool Player should Know > 자유게시판

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There are locks with two, five, and six pins in each keyway, but the keying codes aren't labeled on them. Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. Pin stacks with partially set spool and mushrooms, on the other hand, will feel a bit different. Now release torque and start over, taking care to pick all the pin stacks with spool/mushroom pins while leaving at least one regular pin stack unset (this will require a light touch and good sensitivity). An alternative technique, which I have not seen mentioned in the literature, is to first determine which pin stacks have security pins and which have regular pins (by picking normally and noting which stacks are false set). 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.

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. These locks add a new challenge: maneuvering the pick. In fact, what is billiards 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. However, because they jam when false set, locks with serrated pins tend to impression very well (impressioning is a decoding technique that produces a working key based on marks left on a progressively cut key blank). The training locks in the lab are a good start, but you will probably learn more quickly if you have access to your own personal practice locks as well. Mechanical combination locks are common on inexpensive padlocks, safe locks, and to control access to high security vaults. This may be a consequence of more stringent European insurance standards for physical security.

A common door lock mechanism in Europe uses a standardized "European profile" lock module. The large board has locks with eight different keyways, representing many of the most common keyway designs used in the US. Their security ranges from being quite rudimentary to being among the most formidable locks in commercial use. Indeed, security system software may well be considerably worse, since it is often purpose-written and may be subject to only limited scrutiny and testing. The underlying locking mechanism is still mechanical and may be subject to mechanical bypass. The electronic control mechanism may be vulnerable to new attacks, e.g., through the introduction of RF or power faults or via "Tempest" monitoring. Master ring cylinders (which are no longer in common commercial production but were once marketed by Corbin) use this mechanism to provide independently-keyed master keying. If you can pick all (or at least most) of the locks on this board, you are well prepared against the typical locks installed in residential and commercial buildings in the US. Serrated pins can be very difficult to neutralize. 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).

While pins are usually set by raising the cut from the plug to the shear line, they can also be picked by first oversetting the cut to within the shell and then lowering it to the shear line. To determine which pin stacks have these pins, gently push up each "set" pin. 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. Do not push up hard against the pins; use just enough pressure to cause the pin stacks to jump. Can I jump the cue ball over other balls? These locks can be picked according to the same principles as used for ordinary pin tumbler locks, but, again, different tools are used to accommodate the different shape of the keyway. Many inexpensive locks are grossly misaligned, making them quite forgiving of chaotic picking technique. While many of the principles of pin tumbler lock picking apply or can be adapted to other mechanical lock designs, a complete discussion of these locks and techniques for defeating them is beyond the scope of this document.