I put my plow on lat night and tried to up the spring preload. I didn't bother putting it up on a jack cause I was being lazy. Tuned the one side up and the tab that the preload nut spins on broke. Now I have no preload. Back to the dealer for warrenty I guess. This is only the second time I ajusted the preload. I can't beleive that it was that week.