Could you not drill down the centre of the shaft (using progressively larger drills). Then tap a thread in it. Then (with a load of loctite) refit and nip up the new nut and retain it with a big washer with hex screw down the middle of the shaft, again with loctite?
Just thinking out loud. I refitted the gearbox in my bike last Xmas. It cost me £100 in parts, gaskets and fluids and a three day weekend.
Just thinking out loud. I refitted the gearbox in my bike last Xmas. It cost me £100 in parts, gaskets and fluids and a three day weekend.
-suck-squeeze-bang-blow-