The C-frame is huge and quite solid, that should not mean that he is not expanding at the terminals. But the real problem was for me that the thread with the large rubberised clamping screw was manufactured so pitifully inaccurate in the middle that makes it easy to slip through the bush in my camera (which did not do the other screws, so it is not due to the jack ...) and also the screw in the inclined part has such little mass containing Allen that the key slips. They can not be boring to them (as shown in Cullman) in the bottom of the C-frame to screw so. "Engineered and designed in Germany. Made in China" written on it. Since the times Cullmänner should look for a decent supplier. Too bad.
