STEP the chair back {(M) on a smooth flat surface, attach the seat frame {L) to the chair back (M), use bolt washer (C) and flat washer (D) in both of hole of seat frame (L) and chair back {M). turn the Allen wrench {A) in Bolt (E), but ont too tight. B.Use the Bolt (F), lock washer {C) and flat washer (D)in the both of hole of west frame (L) and chair back, turn the Allen wrench (A) in Bolt (F). but not too tight. STEP 4:See drawing, assemble the left stretcher (Z).