Not likely that it is anything hard, probably 1018 cold rolled hex stock. But if it took the hex off the shaft, it probably wallowed the inside of the yoke or whatever it drives. That would also need to be replaced.
That it was originally designed with hex drive tells me that it probably needs to be able to slip into the mating piece, either for assembly purposes or to allow for lengthwise movement when running, or both. Possibly the hex wasn't sheared off, but wore from lack of lubrication.
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Today's Featured Article - An Old-Time Tractor Demonstration - by Kim Pratt. Sam was born in rural Kansas in 1926. His dad was a hard-working farmer and the children worked hard everyday to help ends meet. In the rural area he grew up in, the highlight of the week was Saturday when many people took a break from their work to go to town. It was on one such Saturday in the early 1940's when Sam was 16 years old that he ended up in Dennison, Kansas to watch a demonstration of a new tractor being put on by a local dealer. It was an Allis-Chalmers tractor dealership,
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