You just need a new or rebuilt window regulator.
Contact Russ here, I'm sure he has one. His email is
CapriTypeR@gmail.comIf not James Whitt rebuilds them, he's in Mississippi. I can get his info.
The old one is riveted in, you will need to drill the rivets out to remove it. You can rivet the replacement in, or find some small nuts & bolts from the hardware store.
There is a replacement guide on the Yahoo! boards, I'll see if I can grab it and mirror it on my site.