shower curtains pipe fastener replacement thingy

Oke i hate these shower curtain things because after i while they tend to get loose an so you keep pushing them up until you are fed up with it and buy a new one.
Why do they get loose ? Well the design is wrong (maybe). If you jam them in the pipe the force will fade away after a while.
So i made these, they will apply the force from inside out, when the turn the bold the fastener will get pulled in pressing the split up tube part into the wall of the pipe.
I hope this will work better t