Trev.... I may be overtighten...But all is still good after a couple years.. But I run two YS 63fz they both
had props from APC, Zinger in 12.75X3.75 (numbers maybe wrong) up to a 14x4W on T.T. spinners and
no spinner and have not had that problem, same with 4 other members at the field that run that engine???
My prop hub was in great shape from the start and still is....
I think it's Central hobbies that sells a bigger prop washer, But it may be for the bigger YS's??