When I got it, it worked great (I use standard 510 atty and pump cart set-up). Now I have intermittent problems with atty connection. I read the forums and got some sealed shorty 510 to 510 adapters to use to hopefully fix my problem. Well, it didn't work. I got 3 of them, and none work, will not even show atty resistance, just an F1 message like it isn't even there. I don't understand as it seems so many have tried the sealed adapters and they work just fine on lavatubes with the center pin connection. I was hoping for the sealed adapters to work so I could be assured that I wouldn't have juice + electrical problems. These adapters work on my k-go's just fine, so it is not an issue with them. Am I doomed to only use the unsealed center hole adapters? My center brass pin is clean and springs up and down as it should. Thanks for your help!