>How do you tighten the outside mirror?

If it's a non-power (pre-88) mirror,  remove it from the door and you'll
find a nut under the mount (10mm or 13mm, I forget which).  If you tighten
it CAREFULLY, one of three things will happen:

    1)  It will hold its adjustment much better.  You just saved twenty
bucks.
    2)  It will improve for a couple of days and then worsen again.  Buy a
new German mirror from me for $19.95 and throw the old one out.
    3)  The bolt will snap when you try to tighten it.  Be careful changing
lanes or backing up until your new mirror arrives.

-Ron Salmon
 The Bus Depot
 http://www.busdepot.com