Illuminated Metal Pushbutton Switch, 110VAC, 16mm
[SW9-110]

on the wiring diagram for the push buttons you have the load on the Common contact and the line side on the "NO" contact which will not allow you to use the "NC" contact. the line side should always go to the common so you can utilize both "NO" and "NC" is there a particular reason for the auber instruments wire diagram?