1a. Prepare 8 bolt assemblies by first inserting a lock washer (#C) onto the bolt (#F) then a flat washer (#D) onto that same bolt (#F). #B 1b. Prepare 8 bolt assemblies by first inserting a lock washer (#C) onto the bolt (#E) then a flat washer (#D) onto that same bolt (#E). Right Back 2. Align the back rail (#5) and front rail (#6) to the left and right arms (#1,2). Then align an L-iron (#A) to each corner.