I've been using the Joye 510 for a long time and so far haven't found anything better to replace it with. Occasionally though, I can't get a draw at all...nothing, nada, zilch. The battery is new, the atty is new and I can hear the atty heating up so I think all is well there. I am using the tips that don't require batting. When I remove the tip, I can blow through it from the mouthpiece but not from the other end that goes into the atty. Any ideas? This has happened more than once. I've changed the mouthpiece already and that didn't work. I also cleaned out every hole I could find with a toothpick but nothing helped.