FYI RENNLINE 986 Phone Mount
 

So I installed a rennline cell phone mount several years back, I now have new cell phone with magnetic charging, the magnet that came with the holder, didn't hold my phone.

Did a quick check the ball on the mount is 17mm so I went on amazon bought a Mag safe holder that attaches to 17mm ball. Just swapped the old magnet for the new Mag safe one phone stays put.

That's a cool bit of home engineering, thanks for sharing!