Originally Posted by
UKFan4Sure
Thanks to all for the info! I had a hunch the RD wasn't the original. Very interesting that someone went to all of this trouble to swap it out.
It isnt a lot of trouble to swap a RD out. Its unscrewing a bolt and disconnecting a cable, then doing the reverse. It takes 3-15min depending on how much adjusting is needed.
Perhaps the original bent/broke. That's one of many possibilities and a very real one, considering the age and intended use of the bike.