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It won't turn, of course, because the cut of the (single) pin stack is still below the shear line and its top pin is preventing the plug from rotating. The underlying locking mechanism is still mechanical and may be subject to mechanical bypass. You may hear a faint "click." This is because you've pushed the cut (between the bottom and the top pin) up to exactly the shear line. If the shear line is within this gap as torque is applied, it may set. 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. You'll probably want to use one of the smaller LAB picks, although the small Peterson hook will sometimes do with care and practice. There will be a slight "backward" pressure on the torque tool. Insert the tip of the tool in the keyway, allowing enough room for your pick to enter and manipulate the pins. The pick must be strong enough to resist bending or breaking while lifting pins, yet the shaft must be small and thin enough to maneuver freely around the keyway without disturbing other pins.

This keyway is more "open" than the Arrow, and there aren't really any "platforms" on which to pivot your pick. It can become very tempting to "cheat" a bit here and move ahead the moment you get a difficult lock open the first time, but that will only make the rest of the course that much harder. These skills become very important when picking better quality locks, so take your time here. It's hard to learn these skills all at once on off-the-shelf commercial locks, but that's what many people who try to learn lock picking end up doing (before giving up in frustration). Again, try to find and lift all the pins with the different hook picks without applying any torque. 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. In the United States, disk tumbler cylinders are used primarily for padlocks situated in harsh environments, especially by public utilities and railroads. These are typically pin tumbler locks, but their orientation is "upside down" with respect to the convention for locks installed in the United States. Most wafer locks are made to very loose tolerances and have relatively open keyways, however, and are very easy to pick.

This keyway is a bit more "open" (it's intended to allow several different key profiles to fit in it), and so requires the use of a larger pick than the Arrow AR1 keyway does. These imperfections are very small -- as little as .0001 inches in some cases -- but they are what allow us to manipulate ("pick") locks open without using the correct key. 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. While a fairly wide range of torque will sometimes pick these locks, try find the lightest torque that works. When you've mastered the SX locks, try the "Schlage SC" keyway locks. The numbers on the front of the practice locks indicate the keying codes, from the front-most pin stack to the rear-most. There are locks with two, five, and six pins in each keyway, but the keying codes aren't labeled on them.

Lever locks employ a set of "lever" tumblers raised to a specific height by the key bitting. Picks probe and lift the individual pin tumblers through the keyway, while torque tools control the degree and force of plug rotation. Now, while continuing to apply torque, insert your pick and find and slowly lift the pin stack. 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. The top pin of the most misaligned pin stack becomes "pinched" at the shear line between the plug and the shell. The plug/shell border is called the shear line. Now the top pin is above the shear line and the bottom pin is below it. Some wafter lock cylinders (especially certain Chicago-brand locks) are double bitted, with some wafers making contact with the key at the top of the keyway and others at the bottom. Many inexpensive locks are grossly misaligned, making them quite forgiving of chaotic picking technique. The three hook picks in this kit are sufficient to manipulate the vast majority of pin tumbler locks found in the US. Longer handles are as a rule better in torque tools; the farther from the plug the torque can be applied, the easier it is to detect and control fine movement.

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