I just got my car back from service and needed to readjust the rear view mirror. First time I've done this as I am the only person that drives the car. I noticed that the mirror has some 'wobble' on the post. I mean like a half inch or so. The mirror doesn't lose its adjustment nor does is vibrate or shake while the car is being driven but there is definitely play in it that simple light pressure will reveal. Is this normal? Does anyone else have the same condition?