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Which Way to Turn

It can be very frustrating to spend a long time picking a lock and then discover that you turned the plug the wrong way. If you turn a plug the wrong way it will rotate freely until it hits a stop, or until it rotates 180 degrees and the drivers enter the keyway. When the plug is turned in the correct direction, you should feel an extra resistance when the plug cam engages the bolt spring.

The direction to turn the plug depends on the bolt mechanism, not on the lock, but here are some general rules. Cheap padlocks will open if the plug is turned in either direction, so you can chose the directionh which is best for the torque wrench. All padlocks made by the Master company can be opened in either direction. Padlocks made by Yale will only open if the plug is turned clockwise. The double plug Yale cylinder locks generally open by turning the bottom of the keyway (i.e., the flat edge of the key) away from the nearest doorframe. Single plug cylinder locks also follow this rule. Locks built in to the doorknob usually open clockwise. Desk and filing cabinet locks also tend to open clockwise.

When you encounter a new kind of lock mechanism, try turning the plug in both directions. In the correct direction, the plug will be stopped by the pins, so the stop will feel mushy when you use heavy torque. In the wrong direction the plug will be stopped by a metal tab, so the stop will feel [solid[.

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