I happen to have taken my 240 starter to an alternator shop two days ago... they took mine apart... said the brushes were fine and were amazingly thick.... and showed me the two screws which had finally loosened up and were arching at the top of their thread...
I have it apart because they happened to have a 240 starter which matched the serial numbers on mine which someone had ordered and not picked up... got it for $100....
Those bushings are for fixing the old one.....
Are you opposed to fixing the starter yourself ?