Single Field Alternator Rebuild Help!

Wow, that's a lot to take in. I replaced the alt because it tested bad (cannot remember what the oreillys guy said it failed). I set my multimeter to diode and checked all 6 both ways. All the same except one which did not show OF.L the other way so one was letting ac through. The bearings and cups are easy, I guess I could get new diodes and brushes, put it together andve it tested. I really want to save the cases as they are DPCD marked and are in great shape.