If you don't get any further help here, try Farm Industry News. They are great in finding sources for hard to find parts for obsolete equipment or maybe in your case FarmHand has been taken over by someone else. . They helped me out some time ago on an old piece I own.
there is a dealer at Norwood Minnesota, lano Equipment, they sold a ton of those feed mills, they are where I get parts for my 815. Thier phone is 1-952-467-1329. they have always gotten me anything I needed.