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STEP 3 and 4 and 5
1. Fix the seat supporting tube (8) into the main frame (1), to tighten it with the
adjustable knob (13), then slide the seat sliding set (9) into the seat supporting
tube (8), to lock in with the adjustable knob (12).
2. Now fix the seat (5) into the seat sliding set (9), to screw the nut of the seat until
tight.
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