It is the OP here again. Anbody have a suggestion as to what I should do about the RD? See my post above. I am not really sure why it is not springing back.

I looked in my parts stash, and I do have a dura ace 7700 RD that would look good. But looking it up on shimano tech docs it says it can only handle up to 26 teeth on the cassette and has a total capacity of 26 teeth.

As I said above, I have 12-27 cassette, and a 53/39 chainrings, so I need 29 teeth of total capacity. I have heard that shimano under-rates their products, so maybe the 27 teeth on the cassette is ok, but what about the 29 teeth of total capacitity versus the rated 26th teeth?

Jared