Im trying to use the engineer's v_model but when trying to auto rig it I notice the model doesn't have a collar. After trying several times with different bones, I still have no idea what to use as a collar, since everything I've tried so far doesn't work.

Could anybody give me a solution on what bone to use in place of the collar or is the v_model valve provides just really bad?

I'm looking to create an effect where there's a map change, yet the camera position to the model is still the same.

Essentially I'm looking to create the effect used at 1:25 in this video:

https://www.youtube.com/watch?v=cFbn1hIU8XU

If anyone could help that would be great