lcgj, I don't understand what you are saying. I was just describing what I see.

Let me try again ... a picture is worth 1000 words. I though folks might benefit from seeing some actual dimensions, using an actual engine, prop and spinner nut combination.

Here is a pic of my Moki 2.10 with the stock prop nut and washer. The distance from the prop drive to the end of the crank shaft is approximately 1 5/16" (33.5mm)

The thickness of the stock prop nut and washer is approximately 7/16" (11mm). The stock prop nut does extend into the washer - but not into the prop as you can see from the picture.

The thickness of the prop hub of a Zinger 20x8 is a little more than 11/16" (18mm).

That leaves about 4.5mm of thread left (almost 3/16" - but the end of the crankshaft is chamfered. So actually there is about 1/8” of crankshaft thread left (a little more than 3mm). This only leaves about 4 threads for the Higley spinner nut (not quite enough … IMO).

Moses