Mike I would suppose that the key was suppose to be a 5/16" and it has wore the additional material. You might get by getting a 3/8" square key and making it the dimensions that you have with a grinder and file. If it works tighten the heck out of the set screws and check it often. I never been around a NH 851. You could double check this key by going to messicks.com and check the online parts manual They even list prices and ship pretty quick. I"ve used them Hope this helps Tim
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Today's Featured Article - Show Coverage: Godfrey, Illinois Country Days - by Cindy Ladage. Except for last fourth of July's Old Gold show in Springfield, Illinois, I don't remember when it was so hot. Nevertheless, the heat didn't keep vendors and visitors alike from enjoying the third annual Country Day's Event. Jane Elliott said the event was originally a one man show. "Barry Seiler, owner of Country Town Farm Supply store used to invite people up to the Johne Deere store. He would give hats and a free meal for everyone that brings a tractor." Elliott said while this
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