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One method I've used for black panels is to stick a piece of paper on with prit stick. Do all the marking out on that, much easier to see and mark exactly, then punch the positions through it, remove it, and the marks are there. Or just place the paper up to the panel, press to the corners to get the corner positions (I often don't get cutting exactly square) and again, mark out on the paper then place back on and punch through.