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As a general rule, locks mounted on the left side of a door open clockwise, while locks on the right side of a door open counterclockwise. To do this, note that at least one of or must be odd, and that the end point of comes from repeatedly reflecting the top right corner of the rectangle . Once you do this, one of the pins will be in the unset/binding state while the other (the one you set) will be in the set/not-binding state . Only one pin stack should be in a binding state at any given time, of course. If pushed up, it eventually sets and the plug turns slightly (and the pin stack's state changes to set/not-binding). Apply some torque to the plug and feel the two pin stacks with your pick. The numbers on the front of the practice locks indicate the keying codes, from the front-most pin stack to the rear-most. However, regular practice and dedication can lead to noticeable improvement within a few months.

Keep practicing with the two pin lock, trying to lighten your touch as you do, and making sure you consistently can pick the pins one at a time. Find the binding pin and the non-binding pin. It's binding because it's the one most out of alignment in the direction you're turning, and so its top pin is being pinched (gently) between the plug and the shell. You'll notice that it resists more than it did in the previous exercise because its top pin is pinched between the plug and the shell at the shear line by the torque you're applying. Eventually, you'll reach a point where the plug will turn ever so slightly and the pin will not go up any farther. As you lift the pin stack with torque applied, eventually its cut will reach the shear line, allowing the plug to turn; the top pin will then be completely trapped in the shell, while the bottom pin stays in the plug, no longer held down by spring pressure. If you release pressure with your pick while still applying torque, the bottom pin will drop freely, and will not have any spring pressure if you try to push it back up.

See Figure 5. With the tool in the keyway, apply torque and try to turn the plug. Reset the lock by returning the plug to the vertical locked position and try again but with torque applied in the other direction. Try each of your torque tools in the lock. Now release torque and try again, but this time lift the pins as little as you can when you test them, while still distinguishing between the two states. Now, while continuing to apply torque, insert your pick and find and slowly lift the pin stack. For this exercise, you'll be using the two pin AR1 lock. When you feel confident visualizing and using picks to maneuver around the pins in the AR1 and SX keyways, you're ready to start actually opening locks. You may find one of the smaller LAB hook picks to be easier here than the larger Peterson picks, although you can usually still pick this keyway with the small Peterson hook.

You'll probably find the large hook or deep curve pick works well here. This pick is a Peterson "Hook" with a plastic handle. It's possible that the plug will turn as soon as you set the first pin; if this happens, it's because you inadvertently lifted the other pin with the shaft of your pick while you were working on the first one. Learn to apply the minimum amount of torque needed to turn the plug. Vary the amount of lifting between strokes but do not force the pins, lest you overset them. Your goal is to learn to do this with the absolute minimum amount of torque needed to bind the most misaligned pin enough to distinguish it from the other one. The pin is not picked but is not the currently most misaligned one. Tubular locks suffer from the same manufacturing imperfections as other locks and so can be picked with essentially the same techniques. Carom billiards and pool games can be played on either a seven-foot table or an eight-foot table, and even a nine-foot table, which is known as a pro or a tournament table. Soon, people started calling billiards a "pool game." These pool rooms are reason billiards is so popular today.

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