Which way to install the nuts wouldn't be an issue if you used two nuts of the same thickness.
Which, to be honest, is what I've done in the last few years because of my peculiar zinc arrangement.
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Brazing together bronze nuts
- Thread starter spike7638
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Which, to be honest, is what I've done in the last few years because of my peculiar zinc arrangement.
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- Mar 3, 2013
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Other than the crazy price they get for them why not just use a "C" size prop nut and zinc? It's 3/4-10 thread. Typically the shaft is drilled for a cotter pin. 
http://www.boatzincs.com/prop_nut_s...MIkoCp8e6_2QIVxiSBCh1BtwX7EAQYASABEgL24PD_BwE
http://www.boatzincs.com/prop_nut_s...MIkoCp8e6_2QIVxiSBCh1BtwX7EAQYASABEgL24PD_BwE
Answer: lack of clearance between the aft end of the prop and the leading edge of the rudder. And that's even after I enlarged the rudder aperture with a Sawzall, which was a somewhat terrifying activity.
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That's what was on there before the current arrangement. It's far too little zinc for the job, and has to be replaced multiple times per summer, which involves extracting the cotter, loosening one nut, replacing the zinc, reinstalling the nut, snugging it up just enough for the cotter to fit again...all underwater holding my breath.
I don't want to seem ungrateful, but I really do know lots about boats -- just not much about machining, which is why I came to you folks. I appreciate the thinking-outside-the-box that lots of folks have done here, and I'll now go back and noodle a bit more, and maybe even include a picture or two next time, showing the current arrangement, etc.