I was wondering what would be the best way to attach 13" snap-on Moon discs to 14" ford hubcaps. Basically I have the Discs hanging in the rafters and my current O/T car has 14" wheels. I was thinking self tapping screws put in from the inside out so when the wheel turns the screws won't work themselves out. Any other or better ways that I'm missing? Oh the Ford caps are some old '57 ones.