On a 4 stroke I think its false economy to try and use plastic spinners. Go ahead and spend the bucks a get an aluminum spinner precut for the prop you want to use. Unless you pound it in the ground it will be with you for a long time. If its on a funfly type plane have you thought of just using something like a Dubro Nut out front?

Its not the heat that gets them, its the power stroke that does them in.

Ed M.