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It was plain, even in the brief time given me for reflection, that in dealing with this girl ordinary methods would not do, and ordinary exactions were needless. A brief note and further links. Note that other pins may unset at this point, and may have to be picked again. 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. 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. 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. Making keys for these locks often requires the use of special equipment and unusual, proprietary key blanks.

Many dimple key locks also incorporate secondary high security locking mechanisms. Many of these mechanisms involve the use of a "sidebar" that must retract before the plug can rotate. High-security locks often incorporate one or more secondary locking mechanisms beyond that provided by the conventional pin tumblers. Several offer on-site benefits, which have the added bonus of keeping the employee workforce in the office more often. Tubular cylinders typically have four to eight pin tumblers arranged in a circular pattern around the circumference of the plug. 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. 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. 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.

Tubular locks suffer from the same manufacturing imperfections as other locks and so can be picked with essentially the same techniques. If just one pin sets at the "other" shear line, the lock will not open even though all the pin stacks are picked. 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. 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). For example, Mul-T-Lock cylinders use special "telescoping" pins that contain two independently keyed tumblers. The Primus sidebar is keyed by additional side tumblers that engage a secondary bitting cut into the side of the key. A variety of schemes are used to key the sidebar. 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). When the final (non-security) pin is set, the lock should open. A gimbal lock occurs when two axes in a three-gimbal system align.

The two shear lines are keyed independently by a "double height" pin stack, with one set of cuts keyed to each. 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). There's a dreaded condition called the Google 15 that many new employees grapple with when they first start at the company. By so placing causation within Hume’s system, we arrive at a first approximation of cause and effect. Wilson’s main goal is to defend an anti-skeptical interpretation of Hume’s causal inference, but the book is wide-ranging and rich in many areas of Hume scholarship. Hume rejects this solution for two reasons: First, as shown above, we cannot meditate purely on the idea of a cause and deduce the corresponding effect and, more importantly, to assert the negation of any causal law is not to assert a contradiction. 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. 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.

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