One of the brushes on the motor has come out. The retaining spring popped off somehow. The spring on one of the brushes is connected to the neutral wire of the ac power cord. The spring on the other brush, the one that came off, has one end pushing on the brush and the other end doesn't seem to fit any where. It could be bent. I need to know if the end of the spring not on the brush needs to connect to a circuit in some way or just rests on the plastic brack to create tension. Thank you for taking the time to read this and answer.