How to install new brushes the right way.

If you're going to change brushes in your head, take the time to do it right. In fact, the factory probably didn't do it right, so do it now. 

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The image above represents an exaggerated slip ring with two brushes riding on it. the lower brush was put in with no adjustment,  the top brush was seated and it's contact end matched to the slip ring using 300 grit sand paper. Simply cut a strip of sand paper a little wider than the slip ring, lift the brush and fit the sand paper grit side towards the brush. Drop the brush against the sand paper and slip the paper back and forth till the end of the brush makes full contact with the slip ring. This will assure a better contact and will assure the full field current is delivered to the field.