The motor is connected to an eccentric mounting plate, and then the assembly is inserted into an integrated motor holder/drivetrain support. This design allows for quick & easy motor rotation to adjust gear mesh, and yet clamp securely using only a single screw.
To ensure the motor will not loosen in a serious crash or due to insufficient tightening, the motor plate has a bayonet mounting system that prevents it from being dislodged from the motor holder. By rotating the motor mount plate to the opposite direction, the motor can be quickly removed from the motor holder.