Abstract: A stepped frame having at least a pair of substantially planar surfaces oriented one lower than the other has a device for clamping a removable panel to the lower surface. One end of a rigid, unitary member attaches to the upper surface of the frame, while the other end extends over the panel, which in turn rests against the lower surface of the frame. A threaded aperture in the extending end, and a correspondingly threaded clamping screw cooperate to exert pressure on the panel when the screw is positively threaded through the aperture, thereby clamping the panel to the frame.