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Type 190A tuning donut


 

I was moving things around today, and happened to turn the tuning knob on my 190A, and the frequency display didn't rotate.? Turns out the rubber donut was cracked/broken in five places (but still soft!) and had fallen off.? This must be a common failure- is a there a simple, common replacement? If not, I'll have to drag out my box of o-ring and bushing catalogs.
-Dave

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