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See figure 3. Start all four hex washer head selftapping screws (C), then tighten securely using a 1/2" socket wrench. FIGURE 3. 3. Assemble the keepers (D) to the sides of the unit with two hex washer head self-tapping screws (C), using a 1/2" socket wrench. Tighten securely. I Lower Leaf Ramp Section Upper Leaf Ramp Section FIGURE 5. Place upper leaf ramp section inside the lower leaf ramp section. Secure with four hex bolts (A) and — hex lock nuts (B). Tighten securely. See figure 5.