I’ve had the problem occasionally, you go to put a clutch in an engine and the flywheel bearing in has seized, wearing down the spigot shaft, Given the enormous task it can be to remove that shaft and repair or replace it, how do you handle it. Are there custom flywheel bearings with a smaller centre, or do you use shims like you would in a trailer axle.
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The pro workshop solution would be replace gearbox and bearing, the at home best cheap solution would be strip box and replace shaft and seals and bearing, the at home machinist solution would be remove shaft, weld damage and lathe back to size, new bearing and gearbox seals.
The utter bodger would not strip the box at all, but build up the damage with a welder, put the gearbox into top gear and have a mate spin the box from the output whilst you angle grind the weld back to an approximate diameter that fits a new spigot bearing, of course I have never done this. :-)
/r/suspiciouslyspecific lol. I was thinking about using an annular drill bit to cut it down to the next size. Then could use a bushing on the outer or inner diameter, depending on whether one installed a smaller bearing or not.