how do i repair machine?

They are little blocks of spring-loaded, carbon/graphite that remain stationary and deliver electrical power to the rotating part of the motor. Like a pencil they wear away.

YouTube has a video of how to replace - they are all much the same on all W/M motors.... here...

http://www.youtube.com/watch?v=0GmtRBiXLFc

Good luck...

Peccavi
June 2010