I have the st .61 plastic backplate then prop then steel prop washer then the prop nut. only the one nut, the jamb nut would be a second nut of which there is only 2 threads left for that nut. I have another plane the engone does not use a spinner but has an aluminum spinner nut that goes on against the prop nut, maybe I will try this instead af the spinner, although the spinner looks nicer and I should be able to use it there seem to be plenty who use them. I'm new but I haven't heard this happen to anyone else.

thanks

rkliemann