I am ordering up a Odyssey tank because I like the looks of it on my Silver Bullet. Problem is I run at 7.4 volts so I usually run a 2.5ohm cartomizer. On the Odyssey tank it says that the hole is 5 mil lower than on a standard tank cartomizer. I know that somewhere I had seen cartomizers and a punch tool so you could punch your own holes in them. So a couple of questions came up. How much of a difference do you think the 5 mil lower holes would make? I know that I could just refill more often and I do not think it would be that big of a deal but I would still need a second hole in the cartomizer. Do you know where I could get cartomizers for a tank and a punch tool from a website that you trust in the US?