Yeah. It's a steel frame. It think it might be to far gone to do the reverse-thread-in trick. I'll try it, but right now I'm far too frustrated to try.
I simply can't believe I did it! It seemed to be going in smooth as usual then it jammed. When I backed the derailleur out I could see the 3rd or 4th thread was worked! Aaaargh!
Thanks for letting me vent and offering suggestions...