[DampRobot]

Although some of this discussion seems to have centered on mounting the FP gearbox, there are also a number of ways to mount the motor directly. The face of the motor includes two metric taped holes, which can be used to do a face mount of the motor. If you do chose to do a face mount, keep in mind that on a FP motor, it is extremely important to keep the ventilation holes in the face open (FPs are very prone to overheating). And, if you don't mind pressing the pinion on the shaft of the motor after installing it, you can make a hole that is a press fit for the hub on the face of the motor.