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I have one of those sets in my collection. It is hard to see in the picture but the plastic thing above the knobs has the channel numbers in it. A light moves behind them as the channel knob is turned. The side holes are for the secondary adjustments. That set is missing a side knob that is used to adjust the vertical and horizontal holds. There was one knob to make those adjustments. You pulled it off one shaft and stuck it into the hole for the other adjustment. It seems odd but according to the Motorola manual there was just one knob.
Steve
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