So I've been using a gnome cone or one of his variations for a while. I bought a bunch of them for myself and a bunch as gifts and usually got really good responses from Calen. I placed an order a couple of weeks back and haven't heard BOO... not totally unusual but he always did respond to me in a couple of days. after doing some diggin, I found that he has presumably gone MIA. The fish skimmer people and the vape crowd are all saying the same thing. So... what is the next best thing to a gnome heat exchanger for a 19mm fitting? I absolutely refuse to use my mobius for combustion (as I don't combust anymore) and would still like to use it for vaping. I have the cones, it's the heat exchanger part I'm not lacking. Bummed out... any thoughts?