I just thought I'd mention this. I just got some Fluxomizers to try out from Gotvapes. I haven't tried the Fuxomizers yet, but pulled out the rubber tip on one, and it fits really nicely on my 510 Boge 2.0 carto. It seems to stay in really well, doesn't fall out. I usually use a delrin drip tip just for convenience so I don't have to bother with a paperclip and the little cap to refill. These are a nice change.