I love the mini protanks, when I started vaping they were my favorite tank, so I bought two more,3 total. I thought maybe I'd try drilling one, and it worked out so well I drilled all three! Great, great vape. I'm into rebuildables now, but my mini pt2's still in the rotation. Sometimes (and dont tell my friends that I converted to rebuildables lol) I wonder why I even switched to kayfuns, aquas, taifuns, etc, befause my drilled,1.2ohm rebuilt coil mini pt2 hangs with them, if not performs better sometimes. I highly, highly recommend drilling mini pt2s. I used 1/16 also, did all three holes, but you can drill one, try it, and then drill another or all holes if you need. Im contemplating drilling one out, one drill bit size bigger, and see how it vapes. Good luck, hope I helped.