Ok, I ran with a ton of different atty's, got stuck on the Kayfun 4's for quite a while. took some time to get them just right but once i got it, they were great. Or so I thought. got a Goblin clone cheap, and had all the mysterious leaking issues described above. Threw it aside for a month or two ten decided to give it one more try. Likje the Kayfuns, the Goblin works on the vacuum principle. If you want proof of where it leaks(not saying it couldn't be the fill hole/screw, but that's not the most common cause), take a piece of paper towel, make a hole big enough for the 510 post and screw it back onto your mod or wick building setup or whatever. in ten minutes, unscrew it and see where the liquid is REALLY coming from. most likely from between the base and the airflow ring. you actually DO need a little wick in the liquid holes at the bottom of the inner well. Just enough to help the vacuum a little bit. If you want a little tighter draw, go for the bottom layer method. My preference is to trim my wick(cotton is my choice) so i can push just a very small mount into the holes, as in it looks like you could easily push two or three times more wick into the holes. It doesn't seem at all like enough to make a difference, but on the three I own, all hadd the problem and all were rectified by this tiny change. Once it doesn't leak, it is one of the best around and can be had for under $30. I personally run a dual coil using 30 guage Kanthal @ .-.9 watts and 14-17 watts. It blows clouds like a dripper, even using 50/50 vg/pg...