It might not be useful for you but machining a cassette takes 10 min. So if you know someone with a lathe it's an easy job. I've just done it to run an 11sp cassette on an Ultegra 6500 rear hub as the freehub wasn't machinable
I know a guy but he moved back to Sweden with his lathe (@MartinERK) - anyone in London able to assist?
All the nice guys with lathes live in Scandinavia now
@mattyc started
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It might not be useful for you but machining a cassette takes 10 min. So if you know someone with a lathe it's an easy job. I've just done it to run an 11sp cassette on an Ultegra 6500 rear hub as the freehub wasn't machinable