TM 9-2320-209-20-3-3 b. Replacement. FRAME 1 1. Put seat cushion in place as shown. 2. Push down on seat cushion (1) and put two screws (2) through hole in two hinges (3). Screw on two nuts (4). NOTE Do not tighten nuts (4) so that seat cannot be tilted. 3. Push down on seat cushion and using screwdriver, hold two screws (2). Using 1/2-inch wrench, tighten two nuts (4). GO TO FRAME 2 18-28