72bluNblu said

As others have already pointed out it's not really necessary to have a machine shop do it. I would use a drill myself just so the hole is round (vs a die grinder). Drill press would be ideal but a handheld drill would work fine. Step drill would be a good way to do it if you could find one close to the right diameter. I'd want to keep the holes as small as possible, but with a good center register it isn't super critical.

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