Had my NASA buddy go thru the gauge light flexi-board today. Followed your advice. He replaved a bust tang at the highbeam socket and soldered the pins at the board, and cleaned all conacts.
I see now what you meant by a tunnel for the blue highbeam. I managed ot replace the melt blue lens with some mylar blue stuff.
RE: the carbs, I'm going to check those float needles again.