Installed new sod so I wanted to lower wheels so deck wouldn't cut too much. Three wheels dropped right down with a tap on the stud. Fourth wheel took a little more persuasion and moved about a half inch. I still need another half inch to go to make it the same as the other three. I think I may have bumped the bracket holding the stud and now its squished. WD40 did no good in helping with it to move. Any suggestions?