I just bought 2 tanks from vapefest. One is a lava tank from volcano and the other is a dct tank (I think they are both the same - they look exactly alike). My question is with the cartos. Do I have to buy the prepunched ones? My husband has a puncher tool and I tried to use one of his punched cartos and it didn't fit properly. It looks as if when he punched a hole in it, the area around it was also bent so it wasn't completely round. Am I stuck with buying prepunched or did he just do it wrong?