How does a disc detainer lock work?
Impressioning is a technique used in locksmithing to create a working key for a lock by making an impression of the lock's keyway. The process involves inserting a blank key into the lock and then manipulating the key to create marks on its surface that correspond to the position of the pins or tumblers in the lock. These marks can then be used to file the blank key until it matches the correct configuration and can successfully open the lock.
To begin the impressioning process, the locksmith selects a blank key that is the same or similar to the key that would normally open the lock. The blank key is then inserted into the lock and gently turned to the left and right, while applying light pressure with a tension wrench to simulate the action of the correct key.
As the blank key is turned, the pins or tumblers inside the lock will move, creating marks on the surface of the blank key. These marks indicate the positions of the pins or tumblers and provide clues as to the correct configuration of the key.
The locksmith will then use a file or other cutting tool to carefully remove material from the blank key in the areas where the marks were made. This process is repeated several times, with the locksmith inserting the newly filed key back into the lock and testing it to see if it can successfully open the lock.