I have been having a good time with my new grinder and stuffer but there is one part I can't figure out what it is for. It was packed with the stuffer parts and the instructions doesn't say what it is used for. I got the grinder from Harbor Freight. BTW, the grinder is great! It will grind just as fast as you can stuff the meat in. It hasn't plugged up and even grinding pure fat doesn't bother it. I am very satisfied.