STEP2
Align the holes from Front Wheel Holder (6) and Beam Assembly
(5). Then fix them with M10*20 Hex Bolt (7).
STEP3
Place the components assembled in steps 2 above into the
Bottom Fixing Bracket (2), align the holes, install 4pc M10*120
Outer Hexagon Bolt (8) and 4pc M10 Lock Nut (9), and tighten
the bolts.