1966 Barracuda mirrors

Hello everyone,
The mirrors on my 1966 Barracuda won't stay in position. They tilt down from the wind. Is there a way to "tighten" the joint that allows you to adjust them? I've looked for a set score, but there doesn't seem to be one. There is a clip that holds the mirror in, but I Haven't dared pull the glass to check for fear of breaking them. Any help would be appreciated.

Oh, also need a new pin for the trunk hinge....can I buy one, or just make one.

Thanks,
-Travis-