bike4mee
Senior Member
I'm mounting a solar panel. I have a seamed room with screws. In mounting the angle brackets I removed selected screws and replaced them with self tapping larger screws. The screws never seem to bite real well and a few were loose. I don't trust these screws in a thin tubular aluminum frame member. It seems I'm only getting a few threads to bite. I think I'm going to drill all the way through and use carrage bolts pushed up from the inside then nuts and washers. Anybody try this before. I know 4WC mounts a lot of racks to those cross members and they hold. What screws do they use? Glue? I know I need to silicon. Thanks for any ideas