Rearview mirror attachment vibration noise/rattle - Mazda5 2013

Hi folks, I've been hearing this intermittent rattle in my 2013 Mazda5 GT for a while. It was driving us a bit mad, but we've found what looks like the source.

We isolated it to the attachment point of the rearview mirror to the windshield. Applying pressure to the mount stops the noise.

My question is whether anyone else has experienced this (did a search, but didn't find anything similar), and whether anyone has any tips/how-tos on how to investigate and/or resolve?
 
I have the same problem, review mirror vibrates like crazy. I've tried getting to the screw, but I either don't have the correct size allen wrench (I think that's what's needed from previous research I did on how to remove the mirror) or I'm just not in the right spot. You almost have to be a contortionist to get to it and see what you're doing. So for now I'm just putting up with it until I get the motivation to try again.
 
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