The arm rest included with the 6DOF joystick is recommended, as it provides a consistent,
useful fulcrum point for the arm to act on, helping to prevent fatigue. The two steel arm rest bars
have slots and small holes in them. The slots align with the 100 x 100 mm pattern M4 threaded
holes on the underside of the joystick base. The small holes align with the arm rest saddle, and
arm rest saddle optional spacer.
