I had trouble performing the following. Any ideas? Align the bracket on the Backrest Adjustment Support (#20) in between the two Backrest Supports (#25). Secure it with four M8 x 1 5/8” Allen Bolts (#52), eight Ø 5/8” Washers (#55), and four M8 Aircraft Nuts (#57). Adjustment Lever (#26) to allow the Support to go through. two Backrest Supports to the pivot on the Main Seat Support. Secure it with one M10 x 6 ½” Allen Bolt (#47), two Ø ¾” Washers (#54), and one M10 Aircraft Nut (#56).