The manual mirror is controlled by 3 internally mounted cables attached to the control knob and it is quite likely the original mirror experienced some damage to a cable as they stretch very easily, even for something as simple as moving the knob stiffly when there is ice restricting the external movement of the mirror surface.
The external potion of the mirror housing is extremely strong & well secured by three screws through the door to a relatively flat portion of the door. A very slow speed incident would likely cause the mirror to tug at the door just enough to cause misalignment but little or no obvious damage to the door or the mirror.
If the knob is visibly misaligned from the inside, then either the mirror or the mounting surface has been damaged. Close examination of the interior and exterior mounting surface during the mirror replacement should easily identify any damage.
If the door's mounting surface is undamaged, perhaps your mechanic replaced the original mirror with a previously used mirror in which case I would have to suspect the replacement mirror also had an issue.
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Friday, August 7th, 2009 AT 1:25 PM