Step 2:
A. Insert Rail (49) into Main Frame (48), then insert Marbles Bolt (50).
B. Lock Rail (49) and Main Frame (48) together by using Hexagon Bolt (53), Flat Washer
(52) and Nylon Nut (51), then screw Hexagon Bolt (53) well by using two Wrench (#B).
Finally, lock fix Ball Cap (107).
C. Keep the hole of Rail (49) and Main Frame (48) in line, then make Knob (35) through
Flat Washer (36) and the hole to lock Rail (49) and Main Frame (48) in order. Finally,
screw Knob (35) well.
Step 3:
Lock Seat Cushion (19) into Sliding Seat (18) by using Flat Washer (25) and Inner
Hexagon Head Bolt (26).