If your rearview mirror is loose, the problem likely lies with the mounting base itself. The base might have shifted or the adhesive holding it to the windshield might have failed.
Here's what you should try:
1. Check the base for tightness: Gently but firmly try to push the mirror base against the windshield. If there's noticeable play, the base itself needs to be re-secured. This often involves cleaning the windshield where the base sits and possibly applying a small amount of automotive-grade adhesive designed for this purpose.
2. Clean the mounting surface: Thoroughly clean the windshield area where the mirror base contacts the glass. Use glass cleaner and a lint-free cloth to remove any dirt, dust, or old adhesive residue. This ensures a proper bond if you're going to use adhesive.
3. Consider adhesive: If pushing the base firmly doesn't solve the problem, a small amount of appropriate adhesive (check an auto parts store for windshield adhesive designed for mirror mounting) may be necessary. Follow the adhesive manufacturer's instructions carefully. Apply a very thin bead, ensuring it doesn't squeeze out excessively and make a mess.
4. Professional installation: If you're not comfortable working with adhesives or the mirror is significantly damaged, consider taking your Corvette to a professional auto glass repair shop or a qualified mechanic. They have the correct tools and adhesive to properly re-attach the mirror.
Important Note: Do not attempt to force the mirror. This could damage the mirror, the mounting base, or the windshield.