I just received this Cartomizer Punch from http://www.vipvaporcig.com/accessories/ ... punch.html
If you've ever had problems punching holes in a carto, this device solves those problems, but at a price. At a cost of $40.00 it's probably not for everyone but you can't find a device that does a better, more consistent job than this. The adjustable locking side screw makes sure every hole is exactly where you want it and the carbide tip screw pierces the carto like butter! I've included a close up of the screw itself so that you can see how sharp it is and how short the taper is, allowing you to adjust the size of your hole with less than a full turn!
Once the screw come in contact with the carto, two full 360 degree turns of the provided Allen wrench produces a small hole. It requires very little strength to turn so even someone with arthritic hands should have no problem.
Two and a half turns produces a hole this size, which I find perfect.
Three full turns produced a hole that was much too large, as I found out on my first attempt!
That's about it folks. For less than the cost of a new tank you can have perfectly punched holes in your cartos!