80m before Nec Plus Ultra, near the crest, by following a small path perpendicular to La Route des Gorges de Franchard, 60m before the start of the orange circuit AD+ of Franchard Isatis. Start with the lowest crimp for the left hand to the left of 44 Fillette and exit in the left face.
NB: a direct dyno from the ground is possible but difficult to grade.