Hi all. I'm having problems with the retaining rings at the bottom of the motors. To-date two have come off and one was rattling around loose inside the housing. The other managed to get itself between the motor coils and stuck to the magnets. I can replace the rings even if it is a fiddly job. Should i take it back to the shop and get the motors replaced or just get new c-rings. Has anyone else had similar problems? Cheers, Kevin.