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To be clear there is no panic from my side. I was simply passing on information. You mentioned earlier that you have already had two hubs replaced but didn’t bother to tell anyone else. I find that disappointing to be honest.

Of course fitting wheels from other bikes is an option. I’m not sure what it’s like in Germany or other countries but here in Switzerland it is very difficult to legally modify bikes yourself. For example when I imported my 1974 Commando it was fitted with a much improved Norvil front brake, however I was forced to remove that and revert to the pretty poor original brake as the adapter plate and disc had no TüV approval.

I agree with kommando that as the machining of the hub has obviously been taken way too close to the spoke sockets the machining grooves are causing stress risers. If the sidewalls were left thicker I don’t think it would have been an issue. Maybe these hubs were not originally intended to take that size of spoke and were drilled to suit. Maybe some machined hubs have thicker sidewalls? Who knows. Like City Garage said folks need to check theirs report back and then maybe a pattern can be seen.

Anyway, I have been in touch with Norton by phone and email, explained the situation and shared the link to this thread and am waiting for a reply.