Lock Cylinder Tumbler Operation

Each of the 4 cut depths on the key has corresponding double-throw tumbler, sometimes referred to as plates or wafers. The tumbler depth number is stamped on the tumblers for identification. The ignition lock cylinder and front side door lock cylinder share common tumblers that are not self-retaining. The IP compartment door lock cylinder uses unique tumblers that are self-restraining. The IP compartment door lock cylinder also requires a retaining tumbler that does not move when the key is inserted. Its function is to retain the lock cylinder in the corresponding latch assembly.