Your idea will get you going temporarily, but it is not a permanent fix.
Because everything's worn, the bolt idea may push the coupler out of alignment worse than it has been, which will result in a very wobbly pump.
Only permanent fix I see there is a new pump and coupler collar, unless you know a machinist that works cheap and can build up and machine that pump shaft back to a 1-3/8" 6-spline.
It must have been running loose and/or misaligned for a long long time.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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