At the centre of the corridor, on the backside of a characteristic easy slab just right of La Route des Gorges de Franchard, 5 minutes from the parking lot. Low sitstart at the back of the roof, climb that one (morpho) and exit via the prow as for La Gravimétrie raccourci.
From the parking lot, follow La Route des Gorges de Franchard towards the main sector and cross La Route de Tavannes. The boulder is to the right of the path after 50-60m in the descent, in the corridor on the backside of a characteristic very easy slab.