Looks like you have a good rebuildable unit. The main trouble you are having is the starter drive. I believe one comes with the kit. The rest looks good. The brushes look good enough they don't really need to be replaced. If you do they do not have to be curved or broken in. The thin copper sends current to bypass the coil resister. If you put it back like it was it will be OK. I wash the housing & field coils with a spray washer. Soap & water will work. Check the bushings. They are probably OK. Put a pinch of grease on the bushings & the shaft that the drive slides on.
