Update:
I got the speedometer repair manual off eBay (thanks Neil), and though it's a very good and detailed manual, it doesn't address the issue of how the spindle or shaft is attached to the speed cup. It simply assumes that it is. Apparently that's not something one should have to repair. I'll keep staring at it and thinking about it and hopefully something will come to me.
I'll see if Keith from the Old Car Manual Project would like to put this manual on his site.
Thanks,
