TM 9-2320-209-20-3-4 FRAME 2 1. 2. 3. 4. Using 3/4-inch wrench, loosen locknut (1) on adjusting screw (2). Hold straight edge along top of chain (3) as shown. Hold 6-inch ruler at midpoint of chain (3). Push down on top of chain and check that there is 1/2 inch of slack. If there is less than 1/2 inch of slack, using 1/2-inch wrench, loosen adjust- ing screw (2). If there is more than 1/2 inch of slack, tighten adjusting screw. When there is 1/2 inch of slack, using 1/2-inch wrench, hold adjusting screw (2). Using 3/4-inch wrench, tighten locknut (1). GO TO FRAME 3 19-96