ADVANCED SIMRACING Advanced Button Box Mount Assembly And User's Manual page 10

3.
Place the button box extrusion through the installed mount and tighten the 2X
M8 X 12 screws. Tighten snug but not fully. Leave some room between the end
of the extrusion and the chassis bracket to allow rotation.
4.
Reinstall the endcaps on your chassis.
6