fasttech is calling these tanks X8 electric cigarette atomizer. It's a carto tank with chrome caps & a screw in fiil port. It also has a screw horizontal in the bottom cap. Wondered if anyone has used these yet. I assume the bottom screw holds the carto in place. I read a discussion on this tank at the F.T. site and someone mentioned if the bottom screw is out it will leak down the center post. I wondered what that was about. Another thing is the top fill port hole is tiny. When you remove the screw the hole wont fit in my regular syringe I use which kinda sucks. I don't really want any sharp syringes around the house but want to use the fill port how it was intended. Any tips would be welcomed.