Hmm. I tried 2 different types of cartos, several different cartos of the same time, 4 different types of attys, including lr,sr and hv atties. Only 2 work, 1 being a super old atty I got with the riva and the other is the lavatube atty. Anything else won't work on it. I literally have to turn it back notches to get it to fire but the second I pull the driptip the atties move to the side and short it out. This really can't be a problem on my end as I get the same results with all different kinds of 510 accessories. Here's a question, Is anyone using a boge, smoktech, gh1, or joye atty or carto and has had no problem with the threading and has an atty that seats nicely and fires everytime? This can't be right. I am pretty sure having an atty that doesn't screw in all the way adds for leaking easier too which is annoying. I sent a ticket, god knows how long it will take to get the envelope, then send it to hawaii, then back to me, probably the same mod with nothing changed. It's gotta be a threading issue. Anyone else having problems?