The simple way to remove the drive-end bushing is to find a threading tap that will bite into the bushing a little, and just crank it in there. When the tap bottoms out it will push the bushing out of the housing. Clean up the chips and use a vise and a socket the right diameter to press the new one in. Check for fit on the end of the armature, and do a little scraping with a sharp pocket knife if there are any burrs or tight spots. Lube the bushing sparingly with some high-temperature wheel bearing grease as you assemble things.

The armature looks good- - - -no deep scores or grooves. Use a strip of medium-grit sandpaper (120 or so) and give it a good shoeshine to clean up any oxidation. Good luck!
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!