I did a bit of test fitting with the Moki 2.10 this evening. I put on a Zinger 20x8 prop, no spinner. I used the stock prop nut and washer. There is about 1/8” of crankshaft thread left. This only leaves about 4 threads for the Higley spinner nut (not quite enough … IMO).

It turns out the Zinger 22x6 has a thinner hub. With this combination about ¼” of thread remains for the Higley spinner nut (about 8 threads or 8 turns). This seem like it will work perfectly (and rather inexpensively I might add).

Moses