Rob
Post a pic of your coupler from the side with the pin and 90 degrees to the pin and I'll try to explain better what it is that I did.
Edit: I found a pic of the "Arm coupler" from Jeff in PA. What I did was tap the existing 1/4" holes for 5/16" or 3/8" set screws, I don't remember. Then drilled a 1/4" hole 90 degrees to the old hole for the spirol pin. Like I said I also put some Devcon plastic steel on the shaft to help fill the worn area. The set screws help to keep the whole mess for wobbling and allow you to get it centered. The pic is a replacement that Jeff in PA is making. I would bet that he could make one for you as I described, I would also make the part that fits over the shaft longer so that it engages more of the unused portion of the shaft. You'll have to measure how much longer it can be. In my experience there is around 1/4 of space between the pump seal and the coupler. That part of the shaft is not worn so a longer coupler will get things back to running nice and true.
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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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