i will have to try this simple method. i'm having real bad luck with filling. syringes don't work, and direct dripping on the filller doesn't work either. i get 1 day per carto, and i've used up 40 so far... i can't afford to kill any more cartos.
seems like when i use the syringe, the filler and thread burn since the juice isn't diffusing well enough. and when i did the direct drip, the filler burned and eventually i couldn't get any more vapor out of my carto.
i really hope i can find something that works, because it's really frustrating to not be able to vape for so long.