I agree with Joe. It's probably worth getting the parts and fixing.
This is a good guide for rebuilding tensions.
http://www.tfsr.org/publications/tec...achine_manual/
ArchaicArcane here also has good info. I don't remember the name of it but she started a thread just a day or two ago that shows why you should disassemble your machine's top tension to clean it.
Rodney