When I'm doing a repair like this and the conductive part of the rubber contact is worn out I place a thin self-stick conductive pad over it. I use the kind from ButtonWorx, which I got on Amazon. I keep a universal kit of these self-stick pads in stock in my lab (part number BW-70KIT). There may be other brands that do the same thing, but this is the only one that seems to be readily available in my area. This approach has saved many items from the landfill over the years. I have no affiliation with ButtonWorx, I'm just a satisfied customer. (edited to correct spelling).
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I’m so glad you did this. I’m sure because of planned obsolescence we’re not going to see any 40 year old electronics being revived in the future.
When I'm doing a repair like this and the conductive part of the rubber contact is worn out I place a thin self-stick conductive pad over it. I use the kind from ButtonWorx, which I got on Amazon. I keep a universal kit of these self-stick pads in stock in my lab (part number BW-70KIT). There may be other brands that do the same thing, but this is the only one that seems to be readily available in my area. This approach has saved many items from the landfill over the years. I have no affiliation with ButtonWorx, I'm just a satisfied customer.
(edited to correct spelling).