1" shaft was an little known option starting about #275 when they realized that the 3/4" was a bit light, and then became standard toward the end of the #400s. When I was a kid ... 50 years ago ... I had job straightening pump shafts in a hydraulic ram device ... after we had run them through a hardening cycle. You might check with a machine shop to see if they can do it as it was a pretty simple operation.
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