We used to adjust the the bias spring first and if that didn't work we could reverse the two leads on the ringer. And as a last resort we would add a 1A thermistor in series with the ringer.
Didn’t try to reverse the coil sides, but probably it’s a decent option: some phones start to ring with reduced spring tension, some - not. But this is an old issue for now anyway: I feed all phones from ringing generator now, so the issue doesn’t exist.
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