Anyway to fix it to keep it tight? I get a metallic tapping sound from it. It tightens at first but get's loose very easy. I tried swapping to a different wheel just to see if it was the wheel, it wasn't. I've also tried electrical tape wrapped around the black part of the cap. It' helped for about 2 miles and got loose again. The wheels are the BBS 14" weaves off of a 91 318is.
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