Nature wrote:What did you use for the seal at the bottom?
I heated it up than pushed it over a soda /beer bottle to help to flare it
very hot it will burn you if not carefull
than filled the backside with epoxy
pic below of tube before I filled it with epoxy(top tube)
and a fish tank gravel cleaner works also app 2.0 inch diameter (bottom tube)
the paintball is app 2.25 id