here is a tip for nero big rock and fazon owners. I use 1/4 inch nylon hole plugs for the pillow ball retaining caps to keep dirt and crap from getting into my pillow balls. I get them at lowes in the hardware section. made by Hillman part#881275.they come 2 per pack and fit perfectly in the pillow ball retaining caps.they will work on other trucks with the same size caps.