You mean the stuffing tube is still full after you're finished stuffing your casings? I went to Home Depot and took my stuffing tubes with me, and found dowel rods that just fit in the tubes, then when I'm done and it won't push out any more, i unscrew the tube from the machine, leaving the sausage casing still on the tube and push out the rest of the product from the large end of the tube into the casing so i don't waste any product! you can see the dowel rods in this picture:
Works like a charm and makes more useable cased sausage to eat!
Dowels rinse off easily and stuffing tubes are much easier to clean too!