Replacing brushes is usually fairly easy to do provided you respect the SAFETY aspect (SWITCH OFF + DISCONNECT FROM THE ELECTRICITY). It`s usually just a matter of releasing the electrical connection (usually a tag) , pull up the tensioning spring , removing the old brush and replacing it with the new one. Reconnect the electrical connection . Repeat with the second brush. It doesn`t hurt to clean up all the old carbon dust whilst you have the old brush out of its guide.
daz, June 2008