years ago there was a guy in Toronto who had bought out their old parts stock. once upon a time i knew how to get in touch,but no longer. i mention it though because you might be able to network with used machinery dealers to track him down.
what you need isn't anything proprietary. I replaced my x/y nuts and the y screw. bought the nuts from above mentioned dude just because it was cheaper/easier that buying the bronze, making or buying the acme tap etc and made my own screw. fortunately the long one was in good condition.
although it wouldn't be cheap (but neither will buying from excello), you could easily have the nuts and ground hardened screws made. |