Originally Posted by John Doucakis

I am not sure if I understood correctly but you want to dissasemble the brush tubes?

This is completely wrong. The brush tubes have been glued to the alum endbell with great precision in order to have them perfectly alligned to the armature.

Even if the brush tubes start to move, then your endbell is no longer good.

You don't need to clean them externally, only internally. You may do that by using some paper or cloth with clear alchohol, or for even better results you may use a little polishing cream to make them smooth and shiney.

The same you can do to your used brushes. You can use some polishing cream to clean their surface, thus maximizing the current flow as they will have better contact with the inside of the brush tubes.