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The left two knobs (Vertical/Horizontal and Brightness/Picture) are two-piece knobs (the outer ring and inner knob turn independently). The third knob (Off-Sound) is a one-piece casting (outer ring and inner knob do not turn independently). The light-brown spare knob I have is one-piece casting (will only work as an Off-Sound knob).
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Do not attempt to adjust your set.
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