I had a 4/4 series 1 with a meadows gearbox in the '60s. My speedo drive stopped working and when I took it apart it was a 90deg crown wheel and worm drive. The crown wheel was warn hollow so that the worm did not engage. The parts where not available then and I had no way of repair. After being caught by the fuzz with no speedo I had to sell the car miles away. Today of course I could install a satnav type speedo. Presented with the problem now this is what I would do.
