TM 9-2320-209-34-2-3 c. Adjustment. FRAME 1 Soldier A 1. Tighten screw (1) until all slack is out of chain (2). 2. Tighten four screws (3) and check that there is no slack in chain (2). If slack is found in chain, tighten screw (1). 3. Tighten locknut (4). END OF TASK 18-168