[RC-Monster Mike]

The front endbell is threaded on the Lehner motors. I wouldn't go taking it apart unless you are prepared to lose your warranty. The motors are hand made, and I siuppose it is possible that there was a defect. I would look real close at your setup to make sure something else wasn't the cause. One likely issue is the motor mount screws. The Lehner motors have a very small/short thread on the front endbell, and a screw that is too long will easily damage the windings(which will indeed take out a speed controller).