OK, here's a question. So far, I've used prefilled cartos, but I might want to try different flavors. I tried someone's cinnamon and really liked it. So how do I go about filling cartos? I suppose to start, I'd wait till I used one up that I already have and then refill it w/ e-liquid. I've seen so many ways to clean them and fill them that I'm totally confused. I need one way, the simplest, to do this. I'd appreciate any suggestions. Maybe SteelJan has a video about an easy method? What other supplies would I need to buy to do this? BTW, I have automatic batts, which I like, but I think if I'm careful, I can fill cartos and use them w/o getting liquid into the battery. But I need advice on how to do all this.