{Collins} KWM-2A Tuning Knob Removal Problem

I want to remove the Frequency Tuning Knob to clean it. I saw in the Archives
where a Bristol 99-66 is the proper wrench.

Well, after fiddling with it and sizes up & down, nothing works. Did they change
the set screws along the way ?? My radio is circa 1964.

73, Dick, W1KSZ

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