I broke a tooth on one of the small gears in my derailer. My bike is 24 years old and two of the local bike shops said they can't match up a replacement because the derailer is so old. They want to sell me a whole new derailer. So I'm taking a shot  here to see  if anyone knows of any on-line  resources I can check to get a replacement part. The Bike is a Shogun Trail Blazer 2. The derailer is  a Shimano Exage  something (the rest of the name is worn off).

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