You can spend a lot of money on hole saws and still come out with a crude,
over size hole in sheet metal. The problem is the arbor they come with.
Too much slop.

I found a solution if you have a lathe.
Screw in a 5/8th fine thread bolt and nut.
Turn it around and chuck the hole saw itself. Then turn the
5/8th bolt threads down to make it run true.

Paul Lamar

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