Clumsy, left-handed thread chimney! 
But it finally came together! 
Veepon Tita X AIO
Sturdy One Style RBA (clone)
Suicide Mods Crypt V2 Boro Tank
The Sturdy chimney exchange tricked me, or rather, I tricked myself.
With the usual right-hand thread motion, I couldn’t unscrew it. I already heated it, put it in the freezer, and tried prying it with pliers, until I read the manual that it was left-handed thread. So I kind of ruined the chimney meant for the DotAio. Oh well, I don’t have a Dot anymore anyway. 
