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, and electronic locks. 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. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. Schlage Primus locks also use a sidebar. The sidebar must engage these grooves in order to retract and allow plug rotation. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. Many dimple key locks also incorporate secondary high security locking mechanisms. High security locks are more routinely installed in Europe than they are in the United States.

These are typically pin tumbler locks, but their orientation is "upside down" with respect to the convention for locks installed in the United States. Tubular cylinders typically have four to eight pin tumblers arranged in a circular pattern around the circumference of the plug. 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). 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, it extends out the top. 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). The goal is the strike one ball and bounce it off the sides, hitting the other two on the rebound. 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.

When the pin stack truly sets at the shear line, it will feel like an ordinary set pin. To neutralize a partially set spool or mushroom pin, reduce torque and push the pin up, allowing the plug to rotate backward a bit as you do. The most common security pins are the "spool" and "mushroom" top pin designs, which are thinner in their mid-section. Picking locks with spool and mushroom pins takes practice, both to recognize them and to effectively neutralize them when they are encountered. Effective energy-like, say, the energy of the ocean-always takes the path of least resistance. In general, what is billiards wafer lock picking employs the same techniques and tools as those used for pin tumbler locks. Master keying does not introduce any significant complications for lock picking. Most pin tumbler cylinders can be "master keyed" to allow more than one key bitting to operate it. 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). High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin 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. Instead, they use flat "wafers," typically extending across the full height of the plug. A correctly keyed wafer is flush with the plug on the top and the bottom and allows rotation. 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. These pins falsely set before they reach the shear line. Familiarize yourself with the standard billiards table dimensions and how to set up the balls properly before every game. You can hit any ball regardless of its colour or number, and the first person to pocket eight balls wins the game. Potting a ball into the wrong pocket is a foul, and three consecutive fouls mean that the opponent wins the game.