Thanks @Paul Jones!
Great tip! Just added a bullseye to my drill. (These pix are a re-staging since I'm using the bubble so much. I thought I'd share.)
First pic shows "milling" a "flat". Chucked a 3/8" (headless) bolt into drill chuck and 3-jaw mounted to the tailstock of my shopsmith 10ER. Used a re-purposed 3/4" spade bit as the end mill.
REALLY should have shortened the shank! As there was a little chatter there were a few candidates for the desired flat. :-) I reused the setup to find the optimal one.
I set the 3-jaw on my bench with another bullseye on the face and matched the one on the drill to it as I epoxied.
Doug

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