hi, i have an 8.5" spider coil and I just purchased a coil cover from my fisher dealer, my coil looks brand new. now how do you get the coil cover to stay on? I press down as hard as possible and as soon as i bump something it falls right off. this is the thicker white cover. i tried to clamp it and as soon as i took the clamps off it came right off with it. Any info would be greatly appreciated, thanks