Stamina UX2 Air Bike Owner's Manual page 8

ASSEMBLY INSTRUCTIONS
STEP 4
Attach the SEAT(43) to the SEAT POST(4) with NYLOCK NUTS(M8x1.25)(62) and WASHERS(M8)(67).
Insert the SEAT POST(4) into the MAIN FRAME(1) and lock in position with LOCKING KNOB(46).
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