Hi again. I purchased a summer sausage kit, for10# of meat from Butcher and Packer. It came with four mahogany casings, am I to assume each holds apx. two and a half pounds? But my main question is, I guess, is it doesnt say if they are pre stuck, and I dont see any holes in them. Do i need to take a pin and poke some holes before, or during the stuffing process? Am I correct that the idea is to let air out when stuffing? How can I tell if they are prestuck, as the ordering info didnt say. Thanks in advance, you guys have been a big help to me before. Doug in Pa.