Well, I have pulled, taken apart, assembled, and reinstalled the starter in the car 4 times today. FINALLY got it to work again. The shaft for the bendix is worn. I had a spare Denso starter from small Kubota engine from work. Took the bendix out of that, swapped the gear, and installed it in my MP starter. Works like new again.

On a side note, while doing some "thinking" about the starter, I got some other things rewired on the car, and got all my headlights and taillights working again.