TM 9-2320-209-20-3-4 FRAME 2 1. Using 3/4-inch wrench, loosen locknut (1) on adjusting screw (2). 2. Hold straight edge along chain (3) as shown. Place 6-inch ruler at midpoint of chain (3) as shown. Push in bottom of chain and check that there is 1/2- inch of slack in chain. 3. If there is more than 1/2 inch of slack, tighten adjusting nut (4). If there is less than 1/2 inch of slack, loosen adjusting nut. 4. When there is 1/2 inch of slack, using 3/4-inch wrench, tighten locknut (1). GO TO FRAME 3 19-99