OK I just got a enterprise stuffer from my grandpa. He says it's over 60 years old. He had all the parts for it including the fruit/lard press with plates and pressure disc. My question for you guys is what size is it when it says 31 on the side. all of the other writing is off of it except for the label on the side which doesn't give a size. I figure someone here will know. Can't wait to use this thing !!!!