Have u got a manual for the machine ? I know Jeff (member here) has a Phoenix like yours. He may have a manual etc.

Also, Blair, can u look at some other Williams titles around the same age (1975 to say 1980 model machines-same manufacturer) and find parts from marco's or bay area and find similar switches etc. What about using/modifying later model hardware ? What do the other guys think is a good soloution ? 

C'mon guys, we need a soloution for the resto.lol     ( I think we need Nino's expertise here)