I dont know how to get the nut on the top to tighten. The bolt/post that the nut is on spins as well. There is a notch on the top of the post, but I can't get a screwdriver in there and tighten the bolt at the same time. Is there a special tool or something? if so where do I get one. My whole tire is loose and it causes the truck to wobble if I hit a bump just right, kindof scary. Anyways, Thanks!!!!