Checking the archives there is some discussion of this derailleur. One person mentions how it is attached to the rear hanger. But I cannot figure out how to unattach (is that a word?) a rear Duopar from the hanger. It has a cover where the head of the attaching bolt is, and this cover does not appear to be capable of being removed, though it could, but it looks as if I would have to break it to do so. On the backside of the bolt coming through the hanger, there is a hole in the center of the bolt. The message from the archives mentioned that it is removed by inserting a tool into this hole and unscrewing it. I have attempted to use every allen key size I have that fits into the hole but I cannot find one that will lock onto anything. Could someone please offer some advice for the proper (I have already thought of a lot of improper ways) removal of this derailleur? And if it is allen key, what size?
Thank you.
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Tom Hayes
Chagrin Falls, Ohio USA