I am familiar with the Nivex- indeed an admirerer of the design. I have sketches I made of a Nivex-style design with the <whispering> indexing detents </whispering> built into the derailleur and with two cables one for upshifts and one for downshifts. I wouldn't consider the GS gear a direct descendant of it in spite of a few similarities.
Did the other derailleur mentioned resemble the original GS prototype or was it more similar to the later production unit?
-- http://fineartscrimshaw.com
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