OP thanks
Thanks for these suggestions...I'm at work right now, but when I get home I'll take a look. I believe my problem is one of the second two you listed; either the tension spring is broken or the pivot bushing is jammed. I did experiment with the three holes and adjusting in various ways to fix the problem, but that didn't seem to work. I'll probably be back on later with additional questions/success stories. Thanks again to everyone who posted a reply.