Hi there I also have a Bloog MF, I was shown to hold the carto on a 90 degree angle put a drop turn a wee bit, put another drop, turn a wee bit, and you can get about 28-32 drops in there, a little trick I've learned, so as not to waste juice is to keep a condom on the bottom and it will catch any excess. After you're done dripping, put the mouth thingy back on (lol, for lack of a better word), ease the condom down a little and hold it firmly and blow into it, so no excess juice drips out of the carto when you put it on the battery when you put it back on the battery. Then when you take the condom off, dry the carto threads too. Then of course you have your excess juice, and a full carto.