IVE BEEN THINKING BOUT THIS SOME AND YOU COULD ALSO USE A LONG ALLEN SETSCREW, I OFTEN REPLACE BOLTS IN SB CHEVY RACING ENGINES WITH THEM TO USE AS STUDS. ANOTHER THOUGHT ABOUT THE SPINNER ATTACHMENT, SOME USE A LONG NUT THAT IS TAPED FROM BOTH SIDES WITH DIFFERENT THREADS. ONE HOLDS THE PROP ON AND THE OTHER SIDE IS SMALLER TO ACCEPT A LONG SCREW TO HOLD THE SPINNER ON.
FARMER TED