Backplane: The large plexi piece that forms the back of the assembly.
Servo: Provides the power to turn the hands. Is mounted on the backplane.
Adapter: A little nylon fitting I found that allows a 1/4" tube to be connected to the servo.
Shaft: A 1/4" piece of brass tubing. Hub: An aluminum part that slides on the shaft and has a set screw to tighten it in place.
Gear: Nylon gear screws to the hub.
Frontplane: The front end of shaft is set in a recess in the frontplane. This holds everything in alignment. The frontplane is then screwed to the cabinet directly behind the face.