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Although combination lock manipulation exploits some of the same kinds of imperfections as pin tumbler lock picking, the principles and techniques are quite different and are well beyond the scope of this document. 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. These locks are no more or less inherently secure than standard pin tumbler locks, although the external exposure of their pins makes picking them (and designing sophisticated picking tools for them) somewhat simpler. The basic principles of operation are essentially the same as those of the standard pin tumbler lock, what is billiards except that the tumblers are exposed at the front of the cylinder and a round ("tubular") key is used. They require special picking tools to manipulate the tumblers and apply torque. 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, what is billiards especially for the novice. Often raking is used to best effect in conjunction with pin-at-a-time picking.

However, it is worth experimenting with different rakes and raking techniques to find one or two that work well for you. 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. Raking, in contrast, is a class of picking techniques in which several pin stack may be set at the shear line simultaneously. More than anything else success in picking depends on experience and practice with a range of locks. It is always best to practice with your lock mounted to a door or wood platform, as they are here, or at least fixed in a vice. This technique requires a great deal of practice to master, but has the surprising property of sometimes being more effective against better made locks. These skills become very important when picking better quality locks, so take your time here. 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.

Many dimple key locks also incorporate secondary high security locking mechanisms. Inexpensive and low-power embedded micro-controllers are increasingly serving as the foundation of modern security and access control systems. The electronic control mechanism may be vulnerable to new attacks, e.g., through the introduction of RF or power faults or via "Tempest" monitoring. If you're having trouble, you may be pushing adjacent pins up past the shear line as you pick a pin, causing them to be overset even before they start to bind. 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 are unusual in not requiring springs on the individual tumblers and are therefore especially well suited to outdoor use under extreme conditions.

Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. To determine which pin stacks have these pins, gently push up each "set" pin. Apply some torque to the plug and feel the two pin stacks with your pick. Eventually, you'll reach a point where the plug will turn ever so slightly and the pin will not go up any farther. When the plug turned slightly, it trapped the top pin above the shear line, preventing it from re-entering the plug. If just one pin sets at the "other" shear line, the lock will not open even though all the pin stacks are picked. For this exercise, you'll be continuing with the two pin AR1 lock. Congratulations, you've picked the (two pin) lock. Continue with the AR1 lock board. The large board has locks with eight different keyways, representing many of the most common keyway designs used in the US.