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It's probably unfair for us to jump ahead to this photo because it makes the process of panel separation look so easy. Nevertheless, this is what you're aiming for--bare flanges ready to accept new panels. A little prying persuasion is generally necessary to separate the panels after the spot welds are drilled out, so the flanges will typically have to be straightened out with a hammer and dolly. We should also note that the panel is not just attached around the perimeter--notice the support brace in the center.