A self-learning lock cylinder assembly or lock tumbler and tools capable of teaching the self-learning key configuration of a pre-existing key is disclosed. The assembly does not require disassembly and re-assembly of internal components by a skilled user. The individual performing the self-learning procedure sets the assembly by a simple rotation motion. The individual performing the self-learning procedure can verify that the original key and copies of the original key function properly within the lock cylinder prior to final assembly.

A self-learning lock cylinder assembly or lock tumbler and tools capable of teaching the self-learning key configuration of a pre-existing key is disclosed. The assembly does not require disassembly and re-assembly of internal components by a skilled user. The individual performing the self-learning procedure sets the assembly by a simple rotation motion. The individual performing the self-learning procedure can verify that the original key and copies of the original key function properly within the lock cylinder prior to final assembly.

A segmented lock pin is presented. The segmented lock pin includes a first right cylinder, a second right cylinder, and a coupling member. The first right cylinder is movably joined to the second right cylinder by the coupling member. The first right cylinder is axially, laterally, and rotationally movable with respect to the second right cylinder. When implemented as a driver pin, the segmented lock pin provides no counterrotation feedback during a picking attempt of a lock in which the segmented driver pin is installed once the first right cylinder of the segmented driver pin is in a hull of the lock, the second right cylinder of the segmented driver pin is in a plug of the lock, and an edge of the second right cylinder engages the hull of the lock.