I just decided to pull out my old kanger protank 2 on a smok variable voltage battery and build a coil. It was a stance experience. I built a few 6 wrap 28 gauge coils, they fired a bit but then something would happen and they wouldn't work. Now I build a 12 wrap 28 gauge build on it and it rips! I drilled out the 3 holes to 8/64 and it's great, one thing I can't figure out is I can't have it fully screwed on(the tank doesn't leak just the part where the battery connects with the atomizer doesn't screw on all the way) anyways, this is great and I'm loving it!