You have one of the last models built. As you found out, most outboards die of neglect. This is the parts book . . .
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As you can see, the prop shaft thrust bearing and pinion bearing are rollers. You can drill a hole in the plug in front of the prop shaft to drive it out, and then tap the hole for a pipe plug. Dad built out the front of his to a knife edge, but he was a bug on speed.
