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 - What Oil Should I Use? - by Francis Robinson. I keep seein this question pop up over and over again in discussion groups all over the web. As with many things there are often several right answers and a few wrong ones. Some purist I'm sure will disagree to no end with what I will tell you but most of us out here in the real world don't really care do we ? Some of them only bring their noses down out of the air long enough to look down them anyway. If you are like me you are only doing this old tractor stuff because you enjoy it. You
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