Rob
If the input shaft is worn the best thing to do is to replace the shaft. BIG $$$$$. I had one years ago that was worn, what I did was drilled the coupler or arm as they call it 90 degrees from the pin hole and tapped it for set screws to hold it from moving. I also used some Devcon plastic metal. I was working a couple years later when I sold the tractor. Never did like that design with only a pin. Good luck.
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2264 with 54 GT deck
1641 AKA Black Jack with a 402-E Haban Sickle bar mower
JD317 dump truck
BX2670 with FEL
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