I feel rather stuck at the moment: don’t dare to tap the dropout hole afraid of ruining the frame, maybe have to find someone, cannot find double chainsets below 40t, have hard times understanding which chainrings might fit possible TA or Stronglight new cranks and unsure if and which other Simplex derailleurs might be of use to obtain the target gear ratio, provided I can find them.
Anyone any other comments/suggestions on the above problems, possible solutions and tests?