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The board may help the two slugs track together. The tuner is very much like a ganged variable capacitor tuner only on this one the coils are the variable type and the caps are fixed. I know Zenith used variable inductor tuning on most of its early FM radios although I've never seen this mechanical set up before. I've seen ones where a cam on the shaft pushes against a yoke that the rods on the slugs are attached to.
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