There is going to be one more Philip’s head screw directly across form the one in your picture. Use a No.2 or a little larger screwdriver to tighten both of them. You see where they are in your picture and you now know where they are, so you are just going to have to feel your way up to them and tighten them once you find them with your fingers and screwdriver.
2016 Rockwood Windjammer 3029W Diamond
2015 Chevy 3500HD LTZ 6.0 Crew Cab 4x4 Long Bed 4.10:1 SRW