Ok so from what I see the old shaft is 7/8th and the new is 1 inch. Just find somebody with a lathe in their shed and get them to bore the coupling. Try your local bearing shop and they usually know somebody who can do it. He will also be able to set you right on the keyway which is a simple fix. And as I don't know if the coupling is held on by a bolt in the end of the crank ( I doubt it) while you are getting the coupling bored out I would get a grub screw fitted in the coupling so it locks down on the keyway another simple job if you have the tools

Last edited by NormK; 04/02/23 10:08 AM.