I have a TM504 which has one of the springy brass-coloured contacts on the back-plane mangled. I have tried removing one of these contacts from a spare back-plane connector with no success - they just get destroyed. I think if I could obtain a good contact, I might have some luck in fitting it to the damaged back-plane. This might mean that I will have to destroy a plastic back-plane connector to obtain one, unless someone has a broken back-plane connector that has loose contacts. It seems that these connectors were originally made by EDAC, but he modern ones don't have the same contacts - they are nickel-plated brass and are a different size. Similar connectors are made by and for JAMMA, too, but they are also not like the originals.
Does anyone have any ideas or some loose (and correct) contacts?
TIA, Colin.