hope this tips useful for you.....maybe you may need to replace the mirror or modification the cover ....( see the picture ) ..

1. Push your Side mirror , until you can see this pin , and then release the pin from tiny black plastic tip.
2. After the pin released , pull the cover slowly and it can be release easily .
3. Remove the cover .
4. to make it free , pull / release the spring from the metal tip .
5. The side mirror can be bend easily , and you can change the mirror or etc.

do the reverse action to get it back to normal again . Dont forget to place the pin at the plastic tip before put the cover back again , once you do that it automatically hold the cover . Apologize for my poor english , hope you dont make a mess up because of missunderstanding...he...he..he...