Rear view mirror ball joint suddenly loose

Today after grocery shopping returned to the car, took down the sunscreen and the mirror was bumped (which happens often) but it made a much larger motion than usual. Straightened it out, then tried to flip the night/day tab and the whole mirror moved. That's new, usually pushing the tab back and forth does not move the body of the mirror at all. Gave it a light shake and the part mounting to the windshield is tight but the ball joint where the arm goes into the back of the mirror is loose. Not completely loose, but much looser than it should be.

It's much too hot and sunny to mess with this now, but once it cools off, is there a way to tighten that joint? Looked at the manual and there was no indication that the ball joint is adjustable, or even if it could be taken apart and reassembled (to wrap the ball in some thin rubber, for instance). This is the type of mirror which has no features at all, just the one day/night tab.

If there is no way to take that joint apart or tighten it, have any of you replaced this mirror with a "Jingea" (B08RMZJ81L) from Amazon? These are about a quarter of the price of an OEM mirror.

Thanks