Hi, we are new to Hi-Lo campers. We have a 2000 Hi-Lo with a bunk bed. The front half of the high low is not rising as high as the rear causing the bunk to be unlevel. I want to adjust the cables. In my mind I picture loosening the locking nut, but then when I go to tighten the adjustment nut the bolt will just spin and then spin the cable tighter. Does something keep this bolt from spinning? Do I have to hold it with a vise grips or something from the back side?