Dave,
Good words of wisdom.
Just for fun, I took an old starter that had been laying unprotected in the bed of a truck for decades to see if I could bring it back to life. The part was rusted badly and nothing would rotate. I first dunked the starter in my electrolysis bucket for a day or two and things loosened up enough to enable spinning the shaft and disassembly of the case. A little sanding and greasing, and the darn thing worked! Granted the wire insulation and other parts were unsafe for true service, but what looked like scrap metal "may" be brought back to life. How cool is that!
Paul