BREAKING NEWS!
Those round rubber things, which have many names, but we'll call them chassis cushions. They play a major role in your radio's performance. First, they align the control shafts to the cabinet holes. Second, they prevent microphonics and third, they allow air flow.
Old cushions are just that; old. They are dry, cracked and in many cases, just plain rotten and squished down to flat.
New cushions are availble online, selling for around $20 per set of four. Don't forget about shipping and waiting.
Here's an idea discovered by KS6H. Go to $ Tree and buy a jumbo rubber eraser. Using a hole saw, cut the size for your particular make/model radio. Lightly sand and paint if you're picky. These work for a fraction of the cost and will last longer than gum rubber. See the pictures below and wonder why you didn't think of this.
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