After putting on the coilovers on at the weekend i now have a bit of rubbing and scraping from the rear passenger side, not often but some times i have read somewhere that there is a screw in the arch that can be removed , i have had a look and the only thing i can find is more like a thread just inside the arch near the rear bumper. is this the "screw" that needs to be removed ? if so do you replace it with anything ??