I'm not positive but it looks like the ridges on the frame were made to hold the nut in place while you adjust the bolt. Usually, one side of the binder bolt is held in place by some feature on the frame so you shouldn't need to hold it while you adjust the other side. I think you need a special nut with mating ridges that fits the hole. I don't think it's a common design as I haven't seen one like that before but maybe someone here has a nut that would work. There are other readily available bolt designs around but you'd have to modify the 'fixed' side of hole in the frame to make them work.