It’s finally fixed. After dithering around all summer worrying about what was wrong and if I could source parts from auto wreckers, My friend, who restores MG’s, said to bring it to his place and lets take it apart and see what’s wrong. With me having visions of finding a broken part made of unobtainium, we took the wiper arms off and popped off the plastic cover. Friend said “check to see if the nut is loose”. Friend said he was talking about the one behind the wheel. THE NUT WAS LOOSE. Tightened the nut; tested several times; looked good; reinstalled wiper arms. DISASTER. Wipers tried to wipe everything but windshield. HINT; take a picture of articulating arms at park position before moving everything. After much head scratching, we concluded we’d reattached the articulating mechanism in the wrong position. After some fiddling we got it right. buttoned everything up and now I have working wipers again.
Hopefully, if anyone else has this trouble, my experience will be helpful.