My P&C catalogs have had these new Keystone pipes, the bowl unscrews and they have small clay stones that go in the chamber below it. New idea in moisture absorption. The pipes themselves don't capture my interest, but the idea is interesting. Has anyone purchased and smoked one of these? Also has anyone purchased the keystones themselves and put them in a pipe like a metal stem Viking? I don't now what size the clay chips are or if they would fit, but am curious all the same.