1. Remove the mirror. 
2. Detach claw (A) from the inner side of the outer mirror, and remove the scalp cap.
3. Disengage the claws (A) and (B) from inside of the outer mirror, and remove the outer mirror lower cover.
CAUTION:
Claw (B) cannot be removed from the inner side of the outer mirror. Be careful not to damage when removing.
4. Install the scalp cap and outer mirror lower cover securely.