Window regulator (1963 Dart Convertible)

I'm coming to the same conclusion as you, '63 must be different from '64 up or maybe all the convertibles are a beast all their own. If the arm being popped off is all that's wrong, I'd be glad to weld it back on for you, maybe a couple of bucks for mig wire and gas. It looks like something was binding to break the arm. Have you got that squared away?