On these with rollers or sliders against a cam plate, once the plastic of the sliders/rollers wear a little they get loose as the cam plate no longer holds them tight. And they get loose in the tracks. I had to replace my rollers with Dr Pulley sliders...and BTW, they make the base parts for yours too, and my helix ramps on my secondary by 500 miles because of all the abrasive dirt and dust being pumped through. I also ported the CVT intake to where I could install a filter. That ended the wearing....but not without some PITA. I couldn't go more then about 30 miles on dusty roads or trails without plugging-up that filter. I even put a booster fan on when it started getting hot (also put on a temp gauge) but that only got me an extra 10 miles before I had to be.."That Guy" and stop to bang-out the filter. I've sense installed a Donaldson Top Spin prefilter/particle separator until I could justify the 400 bucks for the S&B. But its working pretty good. Takes out a little over 65% of the incoming dust and it's positions higher so it gets less. Been on four rides now this year and no filter issues...haven't even check them. Guess I should. And its been over a thousand miles sense I've had the cover off so..not bad. Dirt and dust is a killer.