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SideshowBob
More Simplex fitting instructions in the V-CC Library
http://veterancycleclublibrary.org.uk/ncl/pics/Simplex%20Tour%20de%20France%20notes%20(V-CC%20Library).pdf
http://veterancycleclublibrary.org.uk/ncl/pics/Simplex%20Fitting%20Instructions%20c1950%20(V-CC%20Library).pdf
and at Classic Lightweights
http://www.classiclightweights.co.uk/simplex_adjustment.html
http://www.classiclightweights.co.uk/simplex-instruction.html
just get that chainline correct (before you install the chain)
and remember that these were early derailleurs. They had limitations, but part of the pleasure is riding how Coppi, Bobet and others did.
I used these for the setting up a Simplex TDF rd on my bike frame built for my father.