TM 9-2320-209-20-3-3 c. Replacement. 1. 2. 3. 4. 5. Put four washers (1) in place on seat frame base (2). Pull out seat adjusting handle (3). Put seat frame (4) on seat frame base (2) and let go of handle. Lift up seat cushion (5). Screw on four nuts (6) and four washers (7). NOTE Do not tighten nuts (6) all the way. The seat will not slide if nuts are too tight. Using 9/16-inch wrench, tighten four nuts (6). Put down seat cushion (5). NOTE Follow-on Maintenance Action Required: Replace companion seat. Refer to para 18-12. END OF TASK 18-19