Hi!
It sounds like itīs a common problem  
 
 My speedometer-cabel is also broken in/at the hub 

  It has been broken since before I bought my Bagheera. 
        The former owner had weldet some speedometer-drive from an other type of car, on top of the original cabel-drive/connection at the hub, and I have just now because of this thread, discovered that it wasīnt just the original connection that had been broken and then weldet on again. but a different one. 
Now I have cut the weldet thing off..  and it looks like this. 
A 4mm long piece of what I think was the old speedometer kabel fell out, when I cut the weldet thing off.
regards Frederik