The guy messed up with the bypass and he lost the yellow wire. Do you know where to get the little metal connector to repair it. I don't know of any right off hand

Check on some computer cables or wires with connectors for mother board to case. I found one that fit it was the right length and shape the plugs almost looked identical. If I remember right it was from a CD ROM  to a sound card cable. If you don't work on computers and don't have one of these in a box then your best bet is to go to local computer shop and ask them if you can rummage through their misc cables.