Thx for continuing to spitball on this all. I can for sure put 12V to it, I was worried that might damage the starter. When I said I didn’t have another battery, I meant I didn’t have another 6V battery...my bad. Should I reassemble and hit it with 12V?

I am nearly convinced it’s the paint/ground. Can anyone tell me, where do I need to ensure I have metal to metal contact? Between the housing and the pole shoes via the mounting screws? Between the housing and the nose? Between the housing and the brush plate? Cuz I don’t have metal to metal contact on any of these.