Starter generator rebuild looks pretty straight forward. I have 2 that need work. One is weak and won’t turn under load, my guess is needs brushes. The other has a noisy bearing. The replacement bearings I see online look like a pretty common bearing. I may even have one on hand. Spoke with a local automotive shop that rebuilds car starters and he said he doesn’t do these. Any reason I should be afraid to tackle? I feel pretty confident.