I just ordered the Northern #12 grinder, and I can't seem to find out exactly what size the plates are. They just just list them as coarse, medium and fine. I'm guessing they are something like 1/4" , 5/16", and 3/8" ? If anybody knows for sure what size they are....I'd appreciate it! I'm planning a trip to the Sausage Source very soon, and they have plates for #12 grinders. I'd like to get a 1/2" plate for the Northern grinder. But, it almost looks like the Northern coarse plate might be a 1/2" when you zoom in on the photo. Normally, I would just wait until the grinder arrived....but I'd like to get some supplies in advance so I can make some sausage when the grinder gets here. Thanks for any help!