The threaded part measures 20mm long and 5mm across. This is the hub, no markings on it.
This is the hub
Have you actually pulled the hub apart to see what those cones and lock nuts thread onto?
5mm across the bolt thread, but yeah, looks like it's more hassle than its worth. Not taken it apart, I'll have to wait until father visits as he has the right tools.
@gbj_tester started
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The threaded part measures 20mm long and 5mm across.
This is the hub, no markings on it.