I use a bar clamp and CDX plywood
discs with a center hole and a hole drilled through the
bench top to glue and clamp the rings together. If there are
too many
rings
to easily glue at once, then I glue them in sections.Once the bowl is glued up entirely I cut a recessed flanged pocket on the bottom.
I use a
template that is secured with
double-sided
carpet tape to hold the template in place and then I use a
router with a
straight bit to clean out the center area, It is then
followed by a
dovetail bit to finish the outside edge of the pocket. 
This
pocket is then chucked with a expanding chuck and placed on the lathe
for turing.Now the bowl is ready for turning
.
.
.
