WC>Well there's still some hope.
WC>If it's the rubber membrane that must make the contact with
WC>today's extremely high impedence MOSFET inputs it need not
WC>be a great conductor to manage the task.

WC>Heck I'd try a pencil and see if that took.
WC>Carbon black and some kind of conductive adhesive is another option
WC>but that's mere speculation.

The biggest problem is having the conductive material "Stick" to the
Rubber membrane. Adn of course if too much comes off it could bridge the
traces and have the effect of a continious contact.
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 þ SLMR 2.1a þ This note from El Cajon California USA