prolly splitting hairs but hey ho, thats me..
bushes are like a bearing, just without the balls, like a cylinder of brass that supports a rotating shaft...
BRUSHES are little blocks of graphite (carbon), usually attached to a spring to keep them (one each side +ve and -ve) in contact with the motor...
you might find flynny that if you take em out and turn em round youll get another 50 hours out of em to get you out the s**t till your new ones arrive..
anything like that i usually google the model number+'scematic', find the part number and order em off the site that offerered up the scematic, works for washing machines, drills, etc...