What is the pitch of the conductors?

20 conductor, 1 mm pitch, "painted" conductor (not copper strip).

[...]
Tell us where you are, and someone may be able to suggest the name of
a supplier in your area.

SF bay area, N. California, USA.

Bill Sloman, Nijmegen

Thanks for your suggestions, Bill.

On further examination the "flexie" seems to be contiguous with the membrane
switch backplane; it's one piece, so a replacement doesn't sound likely.

Now, if a means exists for easily (!) and reliably grafting another
20-conductor flexie to the good stub, I'm all ears!

Or... other ideas?

Thanks again,
--
John English