 There's a type of screw that you can replace that with. It's like a long lag bolt designed just for gutters. And this way, once you attach it, it won't fall out. And you want to make sure that they slope properly because you're going to put these in sections. You're going to have to sort of plot out that slope, maybe by running a chalk line and snapping a line down the fascia to make sure you maintain the proper angle of these pieces as they get assembled.