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Additional non-electronic speedo questions...

There have been two posts in the last day that make me wish I knew more about
the internals of the mechanical Audi speedometers.  Has anyone dismantled one
and seen how they work?  Are they magnetic?  Anyone rebuilt/recalibrated one
successfully?  Are they similar in operation to, for instance, the speedo on
my '81 Scirocco, which bounced and hunted all over the place and intermittent
whirring noises late in its life?  I seem to remember reading somewhere that
early Porsche 928s had the similar problems with their speedometers...

Times like this I wish I still had my '82 Coupe GT...