Abstract: A lock for use in a display case with sliding doors can be assembled by inserting a lock core and securing it into a lock cylinder from the front of the display case. The lock cylinder has a front, a rear end, a central opening extending from the front to the rear. It is adapted to receive the lock core from the front and has a threaded hole near the front and transverse and open to the central opening. A screw is threaded into the threaded hole such that a portion of the screw extends into the central opening blocking removal of the core from the opening.