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After disassmbling and lubricating its tiny threads I discovered that although the lensheads between B and C are interchangeable, the aperture unit which fits both lens heads has as much bigger bayonet on the C than on the B version. Probably since it was intended for the 6x6format. I wonder which dimensions the Leitz head has?

The "ausløser" knob of the focussing unit seems to be able to close an alectrical contact and not just to move a cable release. Lots of adjustment room for the shoulder support. Also more robust closefocussing tube than the BAL.U, but lacking fine adjustment.
Ja, die Blendeneinheit zum PIGRIFF-B (den habe ich, mit BAL-U) hat ein kleineres Bajonett als der PIGRIFF-C (die C-Blendeneinheit ist mir nur mit meinem 400er T-Kopf zugelaufen).

Zum PIGRIFF-C gab es Anschlusskabel für verschiedene Kamerasysteme (KABEL-*).