-- Perhaps you could use domes. The periphery of the dome sits on one trace and, when flexed, the center of the dome collapses and contacts the trace beneath it, making the connection between the two traces.
-- Hmmm... I don't think you can get them that small.
I think I will have to replace the little rubber button switches in a car radio - I can't find replacement buttons and I'm not sure if conductive epoxy glue would be flexible enough.
Little pcb switches would do fine except that they have contact pins at their edges - is there a variety made with one pin in the centre and the other on the side?
Yup, that's work - I need some about 3/32" in diameter.
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