Thanks, for the redirection, Mr67Stang.
I meant to write aluminum spinner nut.

Ken, thanks, but that manual does not cover the earlier models. The specifications are not the same as what I have.
Even the recommended props differ between that manual and the paperwork I got with the engine.
I bought a 7mm aluminum spinner nut at LHS, and it did not fit.

I've posted my ??? in Club SAITO. Maybe someone there has some insight.

Thanks, guys,
E J