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Driver’s side mirror is noisy so I’d like to play around a bit with positioning.  Loosened the large nut on the bottom and can’t budge it.  Can’t remember if it was their site or another forum that said to give it a good tap, but the ones I’m giving it are not doing the trick.  Maybe I’m just being to gentle.  Any suggestions for breaking these free?

Also any advice on positioning would be great.  Coach is so quiet up front aside from this, passenger side is quiet as can be.