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The appropriate sized hole saw would make the cleanest most uniform cut.
I typically just use a keyhole saw and do it by hand. The fixture will cover imperfections. The hole doesn't have to be perfect.
But if you do cut the lathe with a saw (power or not) I'd suggest not cutting all the way through the lathe on the first cut. If you do, when you want to cut the other side of the lathe out, it will flop back and forth because you've just freed up one side of it. So leave the first side to cut partially attached. Then just punch it out when the other side is close to through.
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