Half put back together, dropped a small spring, searched everywhere, walked away, came back, big LED light, searched again. FOUND IT - basically right by my feet where I had already looked 15 times.
Anyway, got it all together (pressed together, no fasteners), tested it.
LH indicator works, RH indicator plays hazard light.
Oh well, better than no RH. Guess I'll look at it again tomorrow.
Oh, sorry, used contact cleaner inside switch, and soldered closed the hole in one of the pads.
Then reassembly.