EMPLOYEE WAS IN THE PROCESS OF ATTACHING A CYLINDER TO A MOUNTING BRACKET ON A TOW-HAUL TRAILER HITCH. WHILE ATTEMPTING TO LINE UP THE CYLINDER AND BORE HOLE ON MOUNTING BRACKET, THE EMPLOYEE PLACED TWO FINGERS INTO THE BORE HOLE TO CHECK FOR ALIGNMENT. THE TOE OF THE HITCH SUDDENLY DROPPED, WHICH CREATED A PINCH POINT. THE TIPS OF THE EMPLOYEE'S RIGHT HAND MIDDLE AND RING FINGE