Originally Posted by BravoGolf
Here is what I remember though. The motor (mounting plate) is screwed to a circular wooden motor mounting plate via 4 screws in the standard manner. The wooden plate is then screwed with 2 screws that look like drywall screws
to the internal plastic mount which is glued to the foam.
Hope this helps.
I can back this up. It perfectly describes the motor mount in my plane, "drywall" screws and all. The stock motor is 37mm diameter, so a 38mm motor should fit fine.