i have a tendency to overfill my cartridge. when i do this, i just tilt the battery end up a bit when i hit and it usually stops. from what i've read here over the past several months (i quite literally read 90% of the threads that had to do with 510's, got mine, and have been using it for 3 weeks before i actually registered) a liquid gargling sound won't cause any actual damage. even if you flood the atty, you can just let it drain out. a crackling type gargle is bad though. then something is wrong with the atty. if your cart starts leaking, tip the battery end down and/or pull off the cart and tap a bit of juice off with a napkin or whatever. note that for the next hit or two, you'll probably still get a tiny bit of juice in your mouth. but hey, some people like that lol