[brushlessboy16]

Originally Posted by BrianG

Simply add the motor front end thickness (~4-5mm) and add in the thickness of whatever mount you are using.

Actually, I insert a really long screw into each hole and gently turn the screw in by hand until I feel resistance (the coil). Then, I back out a turn or two and then mark the screw threads where they go into the can. Repeat for the other 3 holes and use the shortest measurement.

Impossible. the screws wont hit anything. The motor is designed to protect the windings.