How To Adjust Garage Door Tracks

??

I'm trying to take off those bolts bit but they keep spinning. Any way to keep them from spinning?

Thanks,

How much should the gap between the verticals rail and the edge of the panels?

My garage door (std 2 car garage) keeps disengaging for a second and reengaging "on the way down only" (3 or 4 times on each close in the same spots each time) Opens normally - Any ideas please? So confused guessing maybe a trolley? Happened one day to the next just like that :-( Trying to do cheap as I rent and there is no way my landlord would appreciate my massive 68 Torino parts storage mess lol