TM 9-2320-209-20-3-2 b. Replacement. FRAME 1 1. Line up marks on pitman arm (1) with marks on end of splined shaft (2) and slide pitman arm onto splined shaft. 2. Tap pitman arm (1) near splined shaft (2) with hammer until screw end of splined shaft comes through. Be careful not to hit splined shaft. 3. Put lockwasher (3) on splined shaft (2). Using 1 7/16-inch wrench, screw on nut (4). GO TO FRAME 2 15-10