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 - A Lifetime of David Brown - by Samuel Kennedy. I was born in 1950 and reared on my family’s 100 acre farm. It was a fairly typical Northern Ireland farm where the main enterprise was dairying but some pigs, poultry and sheep were also kept. Potatoes were grown for sale and oats were grown to be used for cattle and horse feeding. Up to about 1958 the dairy cows were fed hay with some turnips and after that grass silage was the main winter feed. That same year was the last in which flax was grown on the farm. Flax provided the fibre which w
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