Thick sheet metal? Bearing separator is my guess.
Id get it fixed asap. It'll only get worse and take out other components. I'd be surprised if it hasn't caused damage already.
Just installed mine as preventive maintenance.
I suggest grinding a bevel as shown in the ebay pic. I accidentally cut a small groove in my driver side visor upon initial installation.
This pic shows groove and the necessary bevel..
I was already bummed about my stickers, but now I'm elevated to mildly pissed off.
I had mine to the dealer for the leak back in the beginning of Nov. They finally got me in today and the third party glass company said they can't do it today because they didn't have the right tools. Jeezus 🙄...