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You must be careful to avoid touching the front-most pin with the blade of the tool, but this position has the advantage of allowing maximum room to maneuver the pick. Reset the lock by returning the plug to the vertical locked position and try again but with torque applied in the other direction. Congratulations, you've picked the (two pin) lock. A pin stack in a lock being picked might be in any of four states: Unset/not-binding. For this exercise, you'll use your torque tool and pick on the two pin lock to put the pins in each of these states to learn what they feel like with your pick. When the plug turned slightly, it trapped the top pin above the shear line, preventing it from re-entering the plug. 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. So far, we've been picking locks "a pin at a time," with a single pin stack set at the shear line in the sequence dictated by whatever misalignments are present in the cylinder.

Now the top pin is above the shear line and the bottom pin is below it. 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. First, apply light torque (as you practiced in the previous exercises) to the two pin cylinder and gently feel each pin. One of them should feel springy, just as it did with no torque applied. 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 . Now, while continuing to apply torque, insert your pick and find and slowly lift the pin stack. Insert the tip of the tool in the keyway, allowing enough room for your pick to enter and manipulate the pins. It is usually possible to insert the torque tool at either the top or bottom part of the keyway.

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. Once you've mastered the two pin lock and can distinguish reliably among pin states, you should have little trouble with a three pin lock. Practice picking the two pin lock until you can do it easily and naturally. Eventually, you'll reach a point where the plug will turn ever so slightly and the pin will not go up any farther. Learn to apply the minimum amount of torque needed to turn the plug. Figure 5. Applying torque. See Figure 5. With the tool in the keyway, apply torque and try to turn the plug. When you reach the shear line, the plug will turn. Some locks will open both clockwise and counterclockwise, but many will only open when turned a particular way, depending on the configuration of the underlying locking mechanism. In Pool, the number of balls in a full set of pool balls varies depending on the type of the game, but a full set includes sixteen balls, each 2 1/4 inches in diameter: eight solid color balls numbered one to eight, seven balls with a color stripe numbered nine to fifteen, and a solid white ‘cue’ ball.

This type of shot is known as a combo shot or combination shot. The typical combination lock design involves a set of (usually three or four) disk tumblers around a spindle connected to the external dial. Learn to pick this lock one pin at a time. Using an inverted pick, raise all the pin stacks to their maximum height. Look for chairs that have adjustable features such as height and lumbar support. While comfort is crucial, aesthetics should not be overlooked when selecting billiard room chairs. One of the pins should be unset/binding ("squishy") while the other should be unset/not-binding ("springy"). Unset/binding. The pin stack is the currently most misaligned one. It feels much as it does when binding and unset, but will not set (since a binding pin can only move up, not down). The lock will never pick open in this state; you must release torque and start over. Borrowed by the British around 1300, it was modified over the centuries: the Scots made golf out of it, the Irish turned it into croquet.

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