I bought this tube / screw as another of a more favorable set relatively quickly broke down. (Apparently, I have tightened too much and now the Plastikzähnchen are canceled) The screw is great because you can just as good as each tube so tighten. One point deduction I give because of the parking handle on the tube clamp as my "cheap version" also "only" made of plastic. And I fear that this may not be keeping to 10 years: - /. BUT ... the thing is definitely more stable than my old version 1000x.
