The stage carrier is a single "L"-shaped component. The bottom is circular, with gear teeth machined into the edge. This unit mounts into a circular piece fixed to the stand.
The entire stage assembly can be rotated through 360° using the lower control knob. Upper knobs control X and Y sample movement.
Circular bevelled rack for the stage rotation. Pinion gear for the condenser focus is in the center (arrow).
The stage has graduation marks for locating specimen position.