How to lay out the hole pattern? I had a difficult time determining if the print was a straight overhead view (showing the curve of the smokebox) or a plan view. In the end we used a tilting rotary chuck. First we indicate the part to get it on center with the rotary. An adjustable chuck like the Buck 'Adjust-Tru' models would be nice here. Then we center the mill head over center and drill the holes with a small drill.
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