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I just stumbled across a nice adjustable hole saw it has cutters on both sides.
I have never seen one like this. Mine has only one cutter on one side. Ought to
be easier and safer.
I bought one similar from harbor freight. It is harder to set up as now you have to set 2 cutters. Used it once and it would not CUT .032, just not heat treated blades. It is in the trash now.
Interesting, about the Al reply s. I now use a single sided cutter and it has cut all of my Al holes to be flanged. I'll let you know when it arrives.