Ross Custom's 3-way switches are a pain to properly wire. but sometimes you have too little space for a 4-way. I am not an electronics guy so for me wiring a 3-way using 4 diodes so that two DZ-2501 controllers controlling two DZ-2500C switch machines could properly align the rails in three spur directions was a real "trial and error" production.
As it happens, there are no wiring diagrams directly on point available from either Ross or DZ to wire a Ross Custom 3-way with DZ-2500s..
Anyway since I had wired the 3-Way for non-derailing as well I decided that if I just wired the three turnouts to three momentary switches ( to ground) I could use those to control the 3-way instead of the two DZ-2501s. However, there are no three-momentary switches that I could find ganged together so I designed and 3D printed one, a 3-switch.
Here are the three 3D parts to create the 3-switch; note the purple is a representation of the circuit board with the three momentary switches attached. The circuit board is just a "break-out" board where I could mount the 3 small momentary switches.
Assembled it looks like this, excuse the art-deco look:
As printed and unpainted, it is this:
The 3-switch is raised up to sit above and between the two DZ-2501 switches on the control panel.
by pushing the "L "the Ross Custom 3-Way turnout sets to the left most spur; "C" center and "R" right-most spur.