I turned my first natural edged bowl last night. I shaped the outside, formed a tenon and shaped the inside. This morning I realized I cannot chuck up the face of the bowl and turn the bottom. I have in the past used a tennis ball as a holder (with the tail stock, of course) but the bowl is too big for that to work. Any hints on how to finish the bottom? I have tried to look on You Tube but found nothing relative. The piece is bay and turned nicely.