I am using the Dali Racing center caps on my 16/17" OEM wheels (the default plastic ones were flaking and ugly). Overall, they're a great match and much better than stock, but a couple of them are not snug and make a horrible scraping noise as they spin. What is the proper way to keep them from spinning - Should I splay the fins out a little bit, or is there something else that I should do to make it a tighter fit so they don't rotate?