Patent ID: 7937976

Claim:
A rekeyable lock cylinder comprising: a cylinder body; and a plug assembly disposed within the cylinder body comprising: a plug body having a longitudinal axis, a transverse axis vertical to the longitudinal axis, a keyhole and a first through hole; a plurality of assembled pins movably disposed in the plug body, each of the assembled pins comprising a first rack component and a second rack component selectively engaging with the first rack component; and a position block disposed at the plug body, the position block having a plurality of pin runners used for disposing the first rack components, a second through hole corresponding to the first through hole and a tool-contacting surface located within the second through hole, wherein the position block can move along the transverse axis-direction of the plug body to make each of the first rack components release engagement with each of the second rack components, wherein the position block has an outside wall and at least one tool-aligning hole, the tool-aligning hole communicates with the outside wall and the tool-contacting surface.