I'm fairly certain that the MG-1 I have is one of the Stern Hall machines mentioned earlier. But in re "standard Key Tronic"... The one here is certainly a foam-and-foil capacitive device like a Key Tronic keyboard is, and surely the mechanism is basically identical (as are its repair methods). It still works --- for now. But the pads aren't little round tablets like the usual KT fare but instead squares with one of the corners notched out (think: the shape of Utah, but squarer). I do not look forward to those pads degrading further and expect it may be necessary to get some kind of custom die punch fabricated in order to produce replacements. I can't easily retrieve the name of the keyboard manufacturer at the moment, but I wonder if anyone knows more about this odd shape of capacitive pad.