I'm working on a window for the top of my case... I already cut the hole with a jigsaw, but of course the edges aren't perfect, so I need to file them down. My question is how do you go about filing metal edges down efficiently? What's the easiest way? Is there a good tool for this? I've tried filing them down with my dremel and it works but it leaves a weird lip that I have to pry off. I've also tried a wide assortment of hand files, but they work at less than a snails pace, almost as if I've never filed it :/