sean, A Generalis-- I know, right, it's like Poltergeist!
Darn things keep moving around on you, coming loose and all!
Not losing your mind!
The screw reset is doing the trick...the tie wrap solution would work fine, too.
I just prefer the screw as it can be done and undone for, say, washing the curtains, without having to cut it off and replace with another one.
But then, how often am I likely to wash those curtains? Probably by 2020...maybe!
And redoing it is hardly a big task!