1. Assess the Problem:
* Wiggle Severity: How much does it wiggle? A slight wiggle might just need tightening. A significant wobble likely indicates a more serious issue with the ball joint or its mounting.
* Mirror Type: Is it a standard interior mirror with a simple ball joint, or a more complex auto-dimming or electronic mirror? More complex mirrors might require professional help.
* Visible Damage: Inspect the mirror's base and the mounting point on the windshield. Look for cracks, broken plastic, or stripped threads.
2. Attempt Tightening (For minor wiggles):
* Locate the Adjustment Nut: Most rearview mirrors have a small nut or screw on the back of the mirror base where it attaches to the ball joint. This is often hidden by a small cover or cap – carefully remove this if present. You may need a small flathead screwdriver or a special tool depending on the design of your vehicle.
* Tighten Carefully: Using the appropriate tool, gently tighten the nut or screw. Don't overtighten; you could damage the threads or break the plastic. Tighten only until the wiggle is eliminated; too tight can restrict movement.
* Test: After tightening, check if the mirror is secure and still adjusts properly.
3. If Tightening Doesn't Work (More significant wiggle or damage):
* Inspect the Ball Joint: If the nut was already tight, or tightening didn't solve the issue, the ball joint itself might be worn or damaged. This is usually a difficult fix and often necessitates mirror replacement.
* Check the Mounting Plate: The mounting plate on the windshield might be loose or damaged. This is less common but can cause instability.
* Consider Replacement: If the ball joint is worn, the plastic is broken, or the mount is damaged, replacing the mirror is generally the best solution. You can buy replacement mirrors at auto parts stores; ensure you get one that's compatible with your vehicle's make and model. Replacing the mirror often involves removing the old one and carefully attaching the new one to the existing mounting base.
Important Notes:
* Safety First: If you're unsure about any step, take your vehicle to a qualified mechanic. A loose rearview mirror can be a safety hazard.
* Vehicle Specifics: The exact location and type of adjustment mechanism varies significantly between vehicles. Consult your owner's manual or search online for your specific car model to find diagrams and instructions.
If you've tried tightening and the problem persists, replacing the rearview mirror is likely the most effective solution. The cost of a new mirror is typically much less than the potential cost of an accident caused by a wobbly mirror.
