Restoration Update: Passenger side view mirror
Right side mirror was useless, due to a worn/loose ball and socket. Phillips head screwdriver modified into "S" shape to reach screws behind glass. Screws were frozen and would not budge. After sitting for the weekend, tapping on the screws did the trick (the threads were a whitish color, probably due to the pot metal base they were in and dis-similar metals).
The first jeweler I visited was not equipped to help me insert a small 10/24 3/16" set screw against the ball. The second jeweler had all kinds of tiny drill bits and taps, but suggested I try a bicycle shop. The bicycle technician sent me down the street to "Alfonso", a motorcycle mechanic. Without any hesitation, he grabbed his large Dremel like tool and jumped right in to drill a pilot hole.
We decided not to try and tap the hole for threads and just began to force the set screw in the pot metal mirror base. It refused to thread itself in. Plan "B" was to force a phillips head screw (of unknown size and thread pitch) into the orifice, and with some fine tuning of the hole, it finally cooperated with our wishes. The pot metal we drilled into was darn hard, and the material left on the top edge of the hole was minimal, but fortunately it did not split during the procedures.
Now the mirror is installed and not so droopy anymore. However, some further road testing will be necessary to determine if the "fix" was permanent or temporary. Three fotos follow: