The fill hole is in the threads. I've got my buddy's HIS in my possession right now cause he was having problems with the resistance fluctuating and wanted to see if it was the atty or just his coil, dude has big hands and had an issue wrapping the positive and negative posts. Anyway, its a decent atomizer but the stock airhole is way to small, the first hit i tried to take i sucked enough
juice through the wick to fill the top cap (I'm used to the draw of a 1/16 hole). The biggest issue i see is the 510 connector they used, it has the 2 small holes used on atomizers that draw air through the connection and you can't take it apart so i don't know what's going on on the inside but i left it on my counter for a day and it was sitting in about a .25ml puddle of
juice that definitely leaked from the 510 cause it was upright the whole time and there was no
juice on the side of the device. I used to want one until i found the puddle on my counter, now I'm glad its going back home soon.
