Simple but useful. My Ball Joint broke from my Wireless Charging Phone Holder in my Car and I needed replacement. So I did the Extra Mile and also created a new Holder for my Air Vent specific for my Car. As one might need only the Ball Joint as a Replacement I will upload it extra so that it could be found better. I created two Versions. One (which I use for months now without any Issues) with the Ball simply on the Pole to Hold it and one with a maybe more rigid Curve from the Pole to the Ball.
The Plate can be screwed from the Back with M3 Screws and M3 Nuts to be placed in the Front. If needed I could add a Version without Holes or one with a “hidden” one to Screw directly into the Pole from the Back. So you can add this to your Existing Holders or maybe an Adapter.

I will add more Pictures when I dismounted the Smartphone Holder in the next Days and have a more detailed View.