Vintage Synth Repair

Hello,

   I own an arp omni 2, and the keyboard is not triggering correctly 
the notes. I have opened it and found that it uses little metal wires 
in each key in order to make contact with a bigger 'ground' bar.

The problem is that several keys have its wires missing and I can't 
seem to find such a metal with its flexibility and conductance near 
me.
I have heard that other arp keyboards from that time worked that way, 
so I thougt some of you might know which kind of metal do I need to 
repair it and where can I find it.


Thanks in advance,


Hardware_Mister.
Francisco J.