Determine which balls you want the cue ball to contact and in what order. It involves hitting the cue ball against one or more cushions before hitting your target ball into a pocket. The usual scheme for master keying involves using more than one cut in some or all pin stacks (this is accomplished by adding additional pin segments). This shot involves striking the cue ball in a way that it contacts multiple balls consecutively before pocketing the intended target ball. The only way to become proficient is to practice. Ilco replacement cylinders are inexpensive and a good compromise between quality and pick-ability for practice (that's what the training locks here are) and are available in a many different commonly-used keyways. 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. Inexpensive and low-power embedded micro-controllers are increasingly serving as the foundation of modern security and access control systems. Carom shots require precise control of the cue ball’s speed and direction, making them a great way to showcase your mastery of cue ball manipulation. What was your motivation that caused you to behave in this way? When executing a safety shot, focus on positioning both the cue ball and target balls in such a way that it becomes challenging for your opponent to make an easy next move. An average pool cue measures 58 inches, so players should ensure the playing area extends at least 58 inches around each side of the table. Aim your cue stick accordingly, taking into consideration any spin or English that may be required for optimal contact. Billiards was originally played with just two balls and an implement resembling a hockey stick. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. Many dimple key locks also incorporate secondary high security locking mechanisms.

In general, wafer lock picking employs the same techniques and tools as those used for pin tumbler locks. More than anything else success in picking depends on experience and practice with a range of locks. These locks are unusual in not requiring springs on the individual tumblers and are therefore especially well suited to outdoor use under extreme conditions. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. 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. Other lock types include "European profile" cylinders, master keyed locks, master ring and SFIC cylinders, tubular pin tumbler locks, dimple-key pin tumbler locks, pin tumbler locks with secondary locking mechanisms, wafer tumbler locks, disk tumbler locks, lever tumbler locks, combination locks, what is billiards and electronic locks. And, of course, electronic locks have at their root software whose size and complexity grows as they become more sophisticated (and as they are networked into centralized control systems). There is no reason to believe that the software used in electronc lock systems is any less subject to bugs, vulnerabilities and protocol failures than the typical (buggy) software used in other applications of similar complexity.

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 two shear lines are keyed independently by a "double height" pin stack, with one set of cuts keyed to each. 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. 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 popular style of tool for these locks decodes them via impressioning techniques. 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. It remains in wide use in certain applications, especially safe deposit locks, safes, small cabinet locks, and mailbox locks.