Clamp for trampoline frame (or other tubes)

This is a replacement for the original misconstructed design - and my debut on thingiverse. The original design and the replacement can both be seen on the first photo. In fact, I am nearly sure no one else needs this. But I post it because my father who does not own a 3d-printer searched a very long time for a part like this and tried several ways to replace it himself. The fact that I needed 15 minutes to model it in sketchup and the print turned out to work ten times as well as the original,