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Step 3:
3.1 pull out the Flat Washer (37), Nylon Nut (38) from Seat Cushion (36).
3.2 lock Seat Cushion (36) into Seat Tube (5) by using the Flat Washer (37) and Nylon Nut (38).
3.3 insert Seat Tube (5) into Main Frame (1), then align the hole and lock Seat Tube (5) with Knob
(46
)
.