I just got them today and when I installed them, they just spun on the Load warrior and let the jack kinda sag at a 45degree angle. No matter how tight I made the bolts, they would not hold. Finally took the whole thing apart and put a mountain bike tube between the two plastic pieces and tightened everything down. It is 100% better. Just wanted to help save somone else the frustration. Also, watch the jack, when it falls, it puts a hell of a dent in your roof, OUCH!