Help my rearview mirror is loose

Anyone that can help answer our question? Thanks very much. I'm trying right now to find it and can't.

 

Mine is loose at the mounting block that is glued to the windshield.

 

Anyone have experience with how to tighten it up on my 05? Thanks kindly.

 

On my 06 I recently gave up keeping the mirror tight. The original on my truck does not have a set screw.
I bought this Jingea on Amazon, it has a T20 set screw. All metal mounting hardware and fits over the original mount glued to the windshield. It also comes with a new one.

The original mirror mounting plastic cracked.

 

Someone kindly donated their stock mirror to me. Both the old one and newer one have the same loose problem. On hot days it’s flopped down every time. Monkeying with it caused a cracking glass noise so now I’m afraid if I mess with it I’ll end up having to replace the windshield.

I believe the answer is the stock mirror simply sucks. On my 87 Supra, if anything it was too tight to adjust. You would think evolution would say they made it good, it would be good moving forward.

 

Thanks guys I think I will leave it be and sell the truck.