This is a simple 42mm diameter motor mount. Inside there are 6 M4 nuts. I used 6 M4x35 screws to fix the motor. I used 3 types of fastenings:
- ordinary
- with a notch, e.g. for brushes protruding from the motor
- with an M3 nut inside to fix the electronics
External holes are dimensioned for M4 screws