Simulation Systems and suggested that the potentiometer might be bad.
They were very helpful and sent me a new one - I just installed
it... and it seems to work perfectly! The splines on the old one were
crushed flat and I think it must have been slipping... Anyway, it
seems to hold cal. just fine now, so I should be able to actually
use it for something other than a big paperweight now! :-)
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