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Is the coil in the meter still functioning, and is there any damage to it of the bearing surfaces?
Is the plastic lens covering the meter intact?
The spring could be replaced from a meter of comparable size. It's anchored at the center pin and the other end connects to base of the meter usually through a wedge pin. On the face of the meter there's a spreader that the spring is fed through for meter adjustment.
The needle could be made out out of some very fine wire or brass shim stock and shaped.
I have repaired them before and it's a bit of trial and error getting them right, but it can be done.
One of comparable size in a Multimeter, VTVM or a old CRT tester might work.
Just check the resistance of the coil between the replacement and the original.
Is there any markings on the back of the meter like 50, 100, 200 uA?
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