When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
a) suspending (holding by cupped fingers) the whole assembly by the bottom of the bowl and having an assistant hit the center tube (protected with a PVC pipe adapter) with a large hammer, and
b) once the tube's top is flush with the bowl, the bottom of the bowl can be pried up and off the tube with a Yankee screwdriver, using the conveniently placed slots in the outer tube.
As stated in a previous thread I found, the bowl isn't on the tube very tight.