Lock cylinder

A lock cylinder comprising:

• a cylinder housing having an upper pin and a longitudinal axis;
• a plug having a lower pin and being disposed in, and cooperating with, the cylinder housing to define a first shear interface at a first radial distance from the longitudinal axis, the plug rotating in the cylinder housing along the first shear interface between a locked position and an unlocked position;
• and
• a slider disposed between the plug and cylinder housing and forming a portion of the first shear interface, the plug being moveable relative to the slider along a second shear interface, the movement along the second shear interface being rotationally limited to movement between a locked position and an interference position, the interference position being intermediate the locked and unlocked positions.

A method of providing a lock cylinder comprising:

• providing a cylinder housing including a plurality of upper pin chambers;
• providing a plug disposed for rotation in the cylinder housing and cooperating with the cylinder housing to define a first shear interface, the plug being rotatable along the first shear interface between a locked position and an unlocked position, the plug including at least one truncated pin chamber and a recess extending circumferentially from the at least one truncated pin chamber;
• and
• providing a slider disposed in the recess and including an aperture that cooperates with one of the plurality of upper pin chambers and the at least one truncated pin chamber to define a generally continuous chamber.