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when meters become old, they can bind from oxidation in their 'needle bearing' mechanisms, which is the type of 'pivot point' that the meters use/have. This is the usual failure point. attempting to repair them can be difficult, but it can be done. The alternative is new meters..which might be tricky to find.
It is not mechanical age, but rather stupid human error (mine, I think). Some years back, I think I mis-calibrated them. It was so long ago, I can't remember what I did. I wish I did...
Then it is likely a tech with a scope, signal generator, and load can calibrate the meters to the standard they are meant to be set for. I expect it's peak watts, not RMS average.