I turn a lot of pieces with the pith in them. With endgrain vases you need to make sure the pith is in the center of the bottom. On bowls I have had the pith in them on the sides. It is best if you can get it about 2/3's of the way up on the bowl on both sides. What I do it before I do any finishing on them I soak the pith and about a 1/2" out from it with thin CA from the outside and inside. After it dries I then do my final cuts. I have one or two here about 2 yrs old and haven't cracked.
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.