DIY Front standart double focusing knobs

Hi everyone, this is my first post in this large format photography forum!
I wish everyone a great Christmas ! :)

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So I am looking to build my 3rd foldable camera, and this time i am in need of mechanical advice.
I can't seem to figure out how the front standart double focusing knobs are made, what goes into what?

I understand how it moves and most of the metal parts used, but the double knobs are still a mystery. How does the smaller knob release the swing, what is it connected to exactly?
Maybe someone has a Chamonix 45F-2 or the Intrepid MK3 and have dissasembled to see for themselves?
I would like to recreate the same thing on my future camera.