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follow up - removed shaft coupling from engine and rotated shaft by hand - no bend. Seems I did not have the coupling properly seated on the output flange.
I have improved that situation and the vibration is largely gone. However, the coupling is still not fully seated.
I tried some emery cloth on the engine coupling but no luck. The shaft coupling is pretty close to the engine coupling so very difficult to access the inside of that for cleaning.
I had the bright idea of trying some lapping compound and then turning the shaft by hand until it went on fully. Very limited progress after several hours of lapping, but some pretty spectacular bruises on my arms!
Will next make up a tool that will allow me to scrape the inner surface of the shaft coupling - a narrow scraper with a "hook" sticking out one side.
Hopefully that will work. Will report.
Any other ideas?
Peter
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