is the process of replacing the old lock pins with new ones, a procedure originally invented in 1836 by Solomon Andrews,. Lock cylinders contain pins, each one in different length and combination to create a relatively unique key bitting. over time the pins ware out and become too short to reach the shear-line causing the lock to jam. in order to fix the lock the old pins must be replaced. other common reasons locks are re keyed are to build master-key systems, make a set of locks share a common key, or to eliminate compromised keys. To rekey a lock, first, the cylinder must be removed from any housing it rests in. Then it must be disassembled, and the plug removed. The plug has cylindrical chambers containing pins that are spaced according to manufacturer specifications. finally replacing the old pins with new ones, putting it all back together and you got a brand new lock.
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