It's not just the ABYC & SAE but also the, USCG, US Navy, Michigan Wheel (largest propeller manufacturer), Dave Gerr - Propeller Hand Book author, Steve D'Antonio, Nigel Calder, Western Branch Metals (largest shafting manufacturer) etc. etc. etc....Secondly, the nuts are in the same orientation as they were when I removed them, not to mention the same as the boats around me. Checked several. As long as they are properly torqued and have a cotter pin installed correctly, there isn't much to worry about. The actual standard is from ABYC and SAE, which is what Mainsail is referring to.
Just because everyone around you installed their prop nuts incorrectly does not mean you need to as well. You may get lucky for another 20 years yet you may not and you may find your shaft has snapped one day and your prop is gone..
Twin engine boat, no lapping, one $3800.00 prop snapped the shaft, found luckily in bottom of slip, and one shaft destroyed.. Port side prop loose, key damaged and both prop nuts had been installed incorrectly...
