Budd Premack <bpremack@wavetech.net>, wrote an excellent post detailing how to
repair the side door power mirror.  After reading it, I suggested to him that
he might amend it to include a suggestion that the bolt and nut have
moderately fine threads and that the nut be secured to the bolt with some Lock
Tite or a dab of adhesive so it doesn't vibrate loose through use on the van.
He suggested that I submit that addendum, and, as Paul Harvey says,
"Now you know the rest of the story."
John