As far as I know the restorers/rebuilders of old speedometers have two
ways of calibration, the tension of the return spring and the degree of
magnetizing the magnets. Magnets are made from special materials but
after making them you have to magnetize them, which can be done to
several degrees. Many older speedo's need to be remagnetized as in time
the magnets may loose their magnetism and read low, a feat not uncommon
to SMITHS/Jaeger speedo's.
Kees Oudesluijs
[demime 1.01d removed an attachment of type text/x-vcard which had a name of
coudesluijs.vcf]
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