I added the mounting holes for the G2SA so the Toolhead PCB mount can be secured to the extruder as well as the X carriage. I had been previously using an Orbiter 2 toolhead mount and the holes do not line up correctly on the X carriage.
You will need 18mm standoff, I purchased these…
https://www.amazon.com/dp/B09X9B86V7
They will screw into the leftover threads on the back of the G2SA. The 5mm spacer is for the screws between the toolhead PCB mount and the x carriage.
The author remixed this model.
Added the mounting holes for the G2SA.