Re: Evinrude 7516 7.5 hp Fleetwin Flywheel nut size?

[Buccaneer]

The crankshaft threads seemed okay. I did find an old castle nut that
screwed on okay, but a little loose I thought. Will re-measure tomorrow.
Chart shows that the Minor diameter of a 1/2", 20 tpi thread bolt is .4387,
so I guess the inside of the nut should be close to that on the veneer
caliper. I went to a small town True Value Hardware and the helpful
lady pulled it out of the box for me, so it could be metric for all I know.

Prepare to be boarded!