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I have a 2010 C4S and wasn't happy with solutions that allow me to use my MagBak Charger with my MagBak case on my iPhone 13 Pro. I bought the Rennline Exact Fit Magnetic Phone Mount, and a sheet of 3M Vhb adhesive. The challenge was interconnecting the MagBak with the Mount.
So, I took some 1/8" X 2" aluminum stock and made the piece in the pic below. I also removed the Rennline round magnetic rubber cover and magnetic plate to leave just the ball mount piece. The part I made is attached to the back of the MagBak Charger with the Vhb. The Vhb was cut out to keep the fan opening of the MagBak clear.
I feel like it's a pretty good solution when using a MagBak setup, which I'm very happy with.