Techniques for Repairing meters

[Huttinger]

Hi all,
    In the bad old days I had a Heathkit AT-1 whose meter died.  I tried in
vain to fix it and over the years have tried to fix many other meters only
rarely succeeding.  I just fixed one where the hairspring had caught under a
crossarm and was giving non return to zero and return to various points on
the dial besides zero due to the hairspring dragging across the crossarm.
Are there any ideas for fixing meters that sometimes work?  Has anyone tried
replacing the guts of a meter with a meter movement of the same full scale
uA rating and used the dial face of the old one?
Regards,
Mike Huttinger

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