Wiring

[Dafni]

Looks good. This will be an awesome RC!

You can insulate the plugs with shrink tube. This will also keep the plugs in place.

A "L" heatsink should fit perfectly on your 1940, I thought.

As for size of bolts to mount it, just measure the mount, heatsink-base, and add 3mm for the motor. My bet is a 8 or 9mm screw would do. Or get a 10 mm and add a washer.



Edit: I just realized where you are worried about shortening! The back plate!
See, the Lehner has a secure endbell, not a glued one. You can simply loose this rear bar on the heatsink!