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This is the RIGHT HAND selector knob for the Quad AM2 tuner. Each tuner has two: one for the waveband, one for the filter. They are symmetrical, not identical. The left-hand selector is available separately. It is recommended to purchase the pair, so both knobs match cosmetically.
6mm M3 grubscrew required. Some trimming may be necessary. For production reasons, holes may be slightly undersize: shaft hole is 1/4", grubscrew hole is 3mm.
The dot is replaced by an indicator line for production reasons.