Vik, the big'n used a 1" hole saw with a 3/4" end cap. Worked ok, but a pain to drill and/or file the end cap.
Medium is a 7/8" hole saw with 3/4" pipe. This was just about ideal.
Small is 3/4" hole saw with 1/2" connector pipe (diameter of end cap). This was a bit loose because the hole saw went wobbly around the pilot. Will have to resolve that. I didn't want a 1/4" pilot so decisions (mistakes?) were made.
I spun the little one by hand against the grinder instead of chucking it into the corded drill.
That's a 6" ruler on the right.
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