This post will help to you if your phone stand is unable to keep the smartphone in the position you want because this part is broken:
Solution: find a hose clamp (in my case 18-32 mm of diameter) and place it like this:
END. If you arrived until here you already could fix your stand. Then, congratulations.
To know more:
My story starts when being in the bed watching or hearing something, having the smartphone hold by the phone stand, the position I want for the phone is not stable and I try to tight the threaded ring with too much strength. I break it. I tried to fix it with tape, cable tie, duct tape, glue, super glue…with no luck. I gave up maybe a year ago or so, until yesterday I had the brilliant idea of a hose clamp.
I bought the cheapest hose clamp, the minimum units:
The model of my phone stand is: Remax RM-C21-detachable 360 rotación Flexible long arm. But I have seen same piece in another stand brands so, if same piece is broken you could fix it in the same way
I hope this information have been useful for you and you have managed to fix it in less time than me (I have had my stand broken and without use during a year more or less!).