[Jukebox-list] How to wire remote cancel button on DS-100

I recently added a remote cancel button to my Seeburg 222 by wiring it to terminals 2 and 3 on the record cancel terminal strip on the tormat selector unit.

Now my cousin has asked me to add the same type of remote cancel switch to his DS-100. Looking online I noticed that his record cancel terminal strip has four terminals (the 222 has only three terminals). I believe the extra terminal supplies DC to a motorized remote volume control if that is added on. All we want to do is add a remote cancel button. Which two terminals should we use for the cancel button hook-up? Thanks in advance, Bruce