I found out how to tighten my rear view mirror to the windshield.
I had my windshield replaced last year at home
Several days later I noticed my rear view mirror wasn't secured tightly.
I tried a torx tool inside the little whole but it didn't find anything in there to turn.
I recently asked the question on a Facebook tech page how to tighten the rear view mirror.
I was told that the little whole in the base by the windshield is for leverage to turn the mirror base 90 degrees either direction to detach and attach and was told to try to use a Phillips screwdriver that fits in the whole snug to turn it to release it and then try to reattach it by turning it back 90 degrees while holding it firmly and flush against the glass
Well that was the trick
It just wasn't attached correctly from when the installer put it back on
Took only a couple minutes and now it's tightly secured