Slotted Camber Adjustment

[tCtCtC]

(This is for my Fit, but FitFreak is usually really slow and the question is universal). I recently installed my Buddy Club coilovers but I have a small issue. The upper hole for the 19mm bolt is slotted to allow for camber adjustment, but it seems that the bolt keeps slipping (as shown below by the white scratch marks) resulting in some noise at certain times. How do I get it to stop moving? I was thinking of replacing the nut with one that has ridges/teeth along it to prevent it from sliding, but I'm looking for a more sure answer. Picture: Input is appreciated. I'm getting my alignment done Thursday, so if anything I'll have them take care of it

[dropzone]

It keeps moving even when torqued to spec?

[jbae1221]

it shouldn't move if torqued to spec