After losing or breaking the pin on my 125 a couple of times I did away with my coupler and pin and did a rag-joint conversion. I found a thread on here somewhere that showed how to do it.
I had a 1250 parts machine and used the drive shaft coupling and rag-joint off of it to add to the front of my shaft. I had to shorten the drive shaft and drill a hole for the pin. I don't remember all the specifics, but it wasn't too hard.
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