What threw me off is one uses a bolt and the other must use a stud.

So the Bolt or Stud threads into the crankshaft.

I ended up with a hedge trimmer crankshaft.
The prop hub will thread onto the shaft and be locked down with a set screw. There is a flat spot on the
shaft already that drives the cutter.

And the prop bolt will simply thread into the fat end of the prop hub.

Well my prop hub has been put off a few days. I may have it by the weekend.