Hi Steve Campbell,
I tried once to use a plastic spinner with a 70 or 90 4 stroke, but the back plate distorted so much from my prop tightening that I couldn't install the cone.....the screws wouldn't line up.
Sorry, I don't remember the brand, probably Dubro or Great Planes. I have to do this to avoid throwing the props or just their slipping,etc. Evidently you have had better luck...any tips?
Thanks