It's a pressure fit between the inner guts of the visor & the long rod (with the 90* bend + the actual mount) that fits inside.
They can be tightened up some but to do that right, the visors have to be stripped down. It's not really worth the effort when they go for cheap @ the wreckers.
The visors without the passenger side vanity mirror are interchangeable side-to-side. So look for a couple of passenger side ones as they always get used way less. But the passenger ones do not have that 2" wide elastic, so if you can live without that...
...and now, The Rant! Lol!
A shop recovered the visors & then charged the former owner for that job when the visors had problems? Not being able to hold themselves in position is a MAJOR fault!
That's not right. ...and if something is not right, then it's wrong! Period.
If they didn't remove the visors from the vehicle, if it was the customer that brought them in, the first 'Q's should of been, "Do they have issues? Do they function properly?"
Even then, while they had them apart, it's part of the job to check & correct. Not doing so is like building a house on a cracked foundation.
Stuff like that ****** me off. Makes the the rest of us in the trade look bad.
Shame on them.