Help me, please. I have the LEM #12 and purchased the Dual Grind attachment. I have had absolutely no luck with it. I have tried to grind chicken, Brisket and chuck roast. All unsuccessfully. It gums up and just chews the meat in the auger tube. Looks disgusting. Hard as crap to remove. It's grinding and leaving gray stuff in the meats. It appears to be metal from off the shaft tip. My meats are almost frozen and the tube is frozen. I have the cap on the auger tube loosened by a quarter of a turn per youtube. It messed up last night. I will call LEM on Monday. Oh, LEM customer service told me not to worry about the gray stuff. It was only a chemical reaction from a break in period.