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 - 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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