steel - Best way to drill square tubing (Without drill ...
2019-10-14 · Seconding @JACK but to use center punch effectively it is best to use a scratching awl (Any sharp thing would work in a pinch) to scribe the center points, Used exactly like a pen/pencil with a ruler or t-square but you leave a small scratch on the surface instead of an ink line, The intersection of two scratches will inherently center a fine center punch and keep it centered when you whack it, the wider hole with the hole punch will center your pilot drill.
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