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You'll probably want to use one of the smaller LAB picks, although the small Peterson hook will sometimes do with care and practice. 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. 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. In the United States, disk tumbler cylinders are used primarily for padlocks situated in harsh environments, especially by public utilities and railroads. Tubular cylinders typically have four to eight pin tumblers arranged in a circular pattern around the circumference of the plug. Electronic locks, of course, do not have mechanical tumblers and are so not vulnerable to many of the physical manipulations exploited in tradtional lock picking.

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). 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 large board has locks with eight different keyways, representing many of the most common keyway designs used in the US. Each wafer has a large rectangular cutout through its middle and through which the key passes; the precise height of the cutout keys the wafer to different bittings. Making keys for these locks often requires the use of special equipment and unusual, proprietary key blanks. There are many different styles of raking, some of which entail the use of special rake picks specifically designed for a particular technique.

Apply very light torque while energetically moving the sawtooth rake in and out of the keyway. 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. 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. Each lever has a cutout, called a gate, through which part of the locking bolt, called the fence or the stump, must travel. The sidebar must engage these grooves in order to retract and allow plug rotation. Many of these mechanisms involve the use of a "sidebar" that must retract before the plug can rotate. Many dimple key locks also incorporate secondary high security locking mechanisms. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. Here, however, tighter tolerances and, in some cases, high-security secondary mechanisms, are more common. The Y1 keyway is one of the toughest you are likely to encounter in real lock installations in the US. If just one pin sets at the "other" shear line, the lock will not open even though all the pin stacks are picked.

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. There will be a slight "backward" pressure on the torque tool. The serrated section tends to false set and jam as long as torque is applied. 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). Snap guns are occasionally successful as well. However, it is worth experimenting with different rakes and raking techniques to find one or two that work well for you. When the energy transfers, the top pin moves up while the bottom pin slows down, and a gap is created between the two pins. For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers.

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