Until now had over two weekends on the water in use and keeps it. Screws are no weaknesses and so far I had no major problems, HOWEVER - now the negative part - the plastic is slightly elastic. If one wants to fix this holder on something that is not a round tube, and pulls the screws firmly, then turn the "wings" of the bracket. While it holds, but now I prefer the screw ever so hard to do it, because I'm afraid it might break the holder.
