I've had CC frame sliders on my S4R for about a year now. They were pretty firm when installed but have gone from spinning easily to a little more loose. The Allen bolts are still tight. I guess it's just the plastic inside the sliders wearing away. Anybody else have this happen. I thought once they got to the free spinning mode, that would be it but now I can rattle them a little. I'm not sure how they are wearing out because they don't spin when I ride. ???? Do they just wear out and you have to replace the plastic pieces? ??? ???