Thanks to all those who suggested ways to fix the power mirror.  I
couldn't find any missing screws or other mounting hardware.  So, using
the control switch, I moved the motor all the way to the right and lined
up the circular tracks  Then I was able to use a screwdriver to move the
lever thereby securing the mirror.  I think I may have pushed the mirror
to far to the right somehow, but a little push on the other side fixed
the problem.

Anyway, thanks to all those who wrote an answer.  I was beginning to miss
the right mirror.

david