Because of this recess I can not put rotated 180 degrees, the camera on the adapter. But if I'm working with a 3D Panhead hits me head on before I either far down or up the camera / move his head. I would then each camera on the ground loosen the plate, rotate it 180 degrees and tighten again. Ei, ei, ei that is bad. This is easily on my 25 year old 141 RC.
What went 25 years ago with absolute stability and no longer is a bad design, a real throwback