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3. DRIVE ShAFT ASSEMBLy - Contains a specially designed liner and the flexible drive shaft. 4. WhEEL - Adjustable up/down, sets depth of blade. A B D Parts Required: PAS or SRM-SB Power Head w/Shaft & Coupling. 1. Set Power Head/Shaft Assembly on a level surface. 2. Pull locator pin (A) out, and turn counter-clockwise 1/4 turn to lock-out position. 3. Remove vinyl cap from attachment drive shaft. 4. Remove cardboard spacer, if necessary. 5. Carefully fit attachment drive shaft assembly into coup