Xiaomi M365 Edition Owner's Manual page 8

Once the handlebar grip is removed, install the bSeen Handlebar Control
Unit in place, and tighten the hexagonal screw located at the back of the
unit.
Step 3
Cut the handlebar grip to size and re-fit it.
Step 5
Step 4
Tighten the hexagonal screw located on the back, to
securely hold the Handlebar Control Unit.