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Might I also sujest that when you mark the holes use a fine marker to make cross hairs slightly bigger than the drill size. Then use a small pilot drill first. Many people who don't drill metal often or if the drill is not properly sharpend will "walk the bit" and the hole will not be where it was marked. If you have cross hairs you can see if this is happening while you are drilling and make corrections so your hole doesn't end up in the wrong place.
Ken
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