Voigtlander Bergheil 9x12 Shift Control Not Moving

[Renato Tonelli]

I can't figure out how to get the Lateral Shift to work on a new to me Voigtlander Bergheil 9x12 Camera.

As best as I can tell, the top left knurled knob is supposed to control the the Lateral Shift; it does not turn. I thought that it might be in locked position via the lever that sits between the pull-out eyelets. Changing its position makes no difference.

I don't want to force the knob with a plier for fear of damaging it. Any ideas?

BTW: The Rise and Fall works smoothly.

Thanks in advance.