STEP 3 (See Diagram 3)
A.) Attach the Butterfly Base (#39) and Butterfly Pulley Bracket (#44) to the Rear Vertical Beam (#38). Align the holes and secure them with two M10 x 2 ½” Carriage Bolts (#102), ∅ ¾” Washers (#89), and M10 Aircraft Nuts (#106).
B.) Insert the axle on the Right Butterfly (#41) through the hole on the Butterfly Base. Secure it with one Lock Ring (#80), M6 x 1 ¼” Allen Screw (#107), and M6 Aircraft Nut (#108).
C.) Push a Butterfly Arm Pad (#58) onto the Right Butterfly.
D.) Repeat Procedures B and C above to install the other side.
E.) Attach the Backrest Board (#33) to the Rear Vertical Beam. Secure it with two M8 x 2 3/8” Allen Bolts (#104) and ∅ 5/8” Washers (#88).
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