Join Date: Oct 2004
Location: DC / Maryland suburbs
Bikes: Homebuilt tourer/commuter, modified-beyond-recognition 1990 Trek 1100, reasonably stock 2002-ish Gary Fisher Hoo Koo E Koo
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Yes, the "cable tension adjuster" sounds like the right part! It's nothing but a hollow screw with a recess in the head that fits the diameter of the cable housing. The inner wire of the cable then goes through the hollow center of the screw, and by turning the head of the screw you can adjust the tension on the cable.
I must have a few dozen of these lying around in my parts box. I'm not sure if the threading is standard, but I could easily drop a couple in an envelope for ya.
I'd be sure to leave negative feedback for this selling if he advertised it as a complete working derailer.