My problem is I don’t trust any of these companies, it’s often hard to tell where thing actually come from. I do have some Whiteside bits and have been happy with them. Never used them on aluminum.
As far as cutting a hole in a aluminum lens board there’s always the lo-tech method of using a jewels saw and half round file or sanding drums on a drill motor. Bottom line is that there are many different ways to do it.
Roger
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