I've seen hubcaps installed with three small machine screws- - - - -they're almost invisible if you use stainless steel. Just drill and tap three equally-spaced holes in the wheel center.
Jerry


"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!