This is a very easy and simple to use cartomizer punch. It's actually the same thing I use.
I'm selling this at a very slight markup and list it here mainly as a convenience.
It comes with the shaft body (also available from drillspot.com) and 2 screws (available from amazon.com).
These screws work very well for the first 40-50 cartomizers. Then it needs to be re-sharpened or replaced. (or it will deform the cartomizer more than normal)
Special thanks to Markfm @ ECF for posting about this.