Ascents of Drunter und Drüber

We wanted to climb "Westkante" but failed to find the correct start. The overhang at the start (first crux of "DuD") is extremely sandy, unfortunately. Because we thought us to be in "Westkante", we didn't go to the second ring of this route here, but instead climbed slightly to the right of it and around the arête to the ledge. The book says there's a bolt on that ledge to belay from, but I didn't find one, so I continued up the slab to the next ledge, which has an abseil station.