signal tool change complete with physical panel button

This should be an easy one but I must be missing something.

I do manual toolchanging in gmoccapy. I've been using the on-screen dialog but now I want to wire an indicator and physical switch on the panel.

I have a physical momentary switch wired into my mesa board. HALshow indicates it's working correctly. I just can't figure out exactly what hal connections I need to make to cause a press of the button to complete the tool change.

My first guess was to net toolChangeDone hal_manualtoolchange.change_button <= hm2_5i25.0.7i77.0.0.input-16
but that did nothing.

After all these years, I still consider myself a HAL noob.

That should be the right pin.
The sim configs for gmoccapy seem not to use manual tool change so I can't confirm with it but I did confirm with Axis.

Manualtoolchange component is loaded in my config but I have no idea if gmoccapy is using it. I only know that setting change_button to true has no effect. Certainly someone has done this already.

I'm on phone so a bit tricky but:

My lathe uses gmoccapy and has a tool changer turret. My toolchange component uses the following hal pins

I believe iocontrol.0.tool-changed is what you want.

iocontrol.0.tool-changed
(Bit, In) Should be driven TRUE when a tool change is completed.
linuxcnc.org/docs/html/man/man1/iocontrol.1.html

can you post all your config files?

Current configuration is here: github.com/sliptonic/millstone