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@Boscarn
If you are trying to get more cable pull from down tube shifters, the easiest way is to fit shifters with a larger barrel diameter i.e. the diameter of the lever that the cable wraps around.
Some early models have a much larger diameter, the most common size for Campag, some Huret and Simplex is approximately 16mm diameter.
The Shimano LB-100 barrel is 20mm and will give 25% more cable pull, the Huret Alvitt is 21mm and an extra 31% will be gained. Suntour power shifters are 18mm, giving 12% extra cable The ones mentioned above are band on, but with a little effort can be modified to fit braze on fittings. I am sure other can be found.