Hello,
I received the button strips of individual contacts yesterday and used them right away.
My blunt feedback...........  These things are brilliant!
I had searched for a good solution for fixing the carbon pill buttons on several older (but very expensive and hard to replace) pieces of equipment.  No other method really works.
Attached are some pictures of the repair on my Marconi 2.4GHz RF signal generator.  Your product worked 100% with no problems.  I have several other instruments that I can also improve with your solution.

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Marconi 2024 9kHz - 2.4GHz RF signal generator