The bed and case guides are made of aluminum. They break when the bed is closed with the yoke not fully retracted into the body.
The case guides are easily made from 1/4 x 1/2 inch aluminum bar stock, a drill, drill bits, and Dremel with cutoff wheel or a thin kerf hacksaw. The case guides were changed to use set screws to align them with the bed guides in place of the shims which were made in 3 thicknesses.
The Top RF Pacemaker Speed is the same basic body as the Side RF Pacemaker Speed.