• Thanks @snottyotter @Skülly @mdcc_tester et al. I'm hoping the polished up cone will hold up to a 20 kg rider for a while and if it gets rough again I'll probably rebuild the wheel unless I stumble on to the hubs in the meantime.

    Edit: I mounted the cone on the axle which I put in an electric drill. I then wrapped a 3mm drill bit in wet sanding paper working my way from 150 up to 1200 grit followed by some polishing paste.

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