Install Back Pad Install screws and washers securing the back pad to the main frame using an 8mm Allen wrench. Item Description Qty. 1 Back Pad 1 2 Main Frame 1 3 Screw, M10 x 1.5, 30mm 3 4 Washer, Flat 3/8" 3 5 Hole Plug, 1" 3 Tighten hardware to 20-25 ft-lb (27.1-33.9 Nm). Install hole plugs to the main frame using a rubber mallet. Parent topic: Assembly Procedure