I use a jam chuck mounted in my chuck. I turn the end to match the bottom of the bowl with some rubber drawer liner you can get from Wally World on the end for friction and to keep it from marring the bowl bottom. I put the bowl up against it and bring up the tailstock to finish the bottom. I finish the bottom until I have the nub as thin as I dare. I remove the bowl and carve off the nub and sand with a 2" disk in my drill press and then apply the finish. Works great.
Retirement: That’s when you return from work one day
and say, “Hi, Honey, I’m home – forever.”
To succeed in life, you need three things: a wishbone, a backbone and a funnybone.