I use a punch and hammer. After I'm done I make a patch with JB Weld (great stuff) You have to hit it pretty hard but you don't want to dent the pan, just punch the hole. Good luck with it, too bad 04's don't have the drain plug, so don't bother looking. You could put on a MB pan that has plugs for right and left handed mechanics. Gotta love those arian engineers!

Les