Step 4: Slide the blocks (15) on the U-Shaped Tube (8), ensuring the straps are facing outward.
Step 5: Align the holes on the U-Shaped Tube (8) with the holes from supporting tube (2), then connect
the two parts. To do this, insert a M8*40 hexagon bolt (9) through a φ8 Nylon Washer (14), the holes on
the U-Shaped Tube, another φ8 Nylon Washer (14) and the hole on the supporting tube. Secure the bolt
in place by screwing an M8 lock nut (7) onto it. Once one side of the U-Shaped Tube has been secured,
repeat this process on the other side. CAUTION: TO ensure the U-Shaped Tube can be adjusted smoothly,
do not overtighten the lock nut. (We recommend tightening to 90% tightness.)