1. Take the hex wrench (6#) out of the ziplock bag.
2. Remove four screws (M8×45) and washers of the bottom tube via the wrench.
STEP 2: Installation of bottom tube
Washer
Installation Guide
3. Align the hole of the bottom tube with the bottom hole of the frame, manually screw the bottom
tube into frame, and tighten it via the wrench.