What causes the abnormal noise when folding the rearview mirror of Boyue Pro?

[Petunia]

Boyue Pro rearview mirror folding abnormal noise is generally caused by insufficient lubrication of the internal torsion spring in the rearview mirror. We can remove the rearview mirror cover, spray lubricant on both ends of the spring, and then manually fold and unfold the rearview mirror to see if the noise disappears. The process of spraying, folding, and unfolding can be repeated multiple times until the noise disappears. Solution: 1. Manually retract and extend the rearview mirror, and clean all visible rotating connected components of the rearview mirror during retraction and extension. 2. After cleaning, wipe it clean with a fiber towel. 3. After wiping, apply WD-40 rust preventive lubricant to the rotating parts, spraying separately during retraction and extension.