I am trying to get a GG joint bowl together for my wychwood and watertools. I found these... They look like they might fit my needs... http://www.planetvape.ca/solo-ground-glass-on-glass-adapter.html but im not sure on the measurments... Has anyone used a solo stem with a wychwood? Can you give me the inner diameter and outer diameter of the bowl if you happen to have one of these? Is there any other options that someone might have stumbled upon?