well, after trying a new Hendu carto with my new Pitbulls, I have decided I do not like the new cartos----really don't like them, even though I do like the Hendu look. With my old cartos, I fill through the battery end, and it will hold at least 15 drops. With the new ones, after I break my tools getting off the cap, the fill will only hold three or four drops before it starts oozing down that little hole. I am now going to save those three little parts from the old cartos to put in the new cartos.
I know that SS are not intended to be refilled and they taste fantastic, but I am going to refill, and I want it to be easier! Nothing tastes better than a new SS carto, but I was going through 5 a day, and I do like my refill go to.