Alex, I had the same problem with my '50 when I converted to 12V. The starter is spinning too fast, I guess, for the bendix gear to engage smoothly. I finally ripped the bendix drive gear. Bought a 12V "small" starter from Tom Telesco in MA and never looked back. In retrospect, I should have taken the starter of and had it changed to 12V when the change was made.
I see 2 choices for you. Do as I did, or do as I should have done. I am happy with what I have done.
Ben
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