Dreaded front sprocket nut issue

[Fazerider]

It's a major job to replace the shaft: the engine has to come completely apart to get the casings split, you can't just post a new shaft in from the side.
When mine failed I resorted to welding the nut on and ran the bike for another 50,000 miles like that. The Scottoiler helped, I only needed to change the C&S once in that period… it feels a bit barbaric to use an angle grinder to remove the weld, but needs must. :evil