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I didn't find one particular crux as the whole route felt the same.
The route is just left of the dihedral climb called A Sharp, the route starts at the toe of the buttress. While the guide Tough Schist claims the start is climbing the thin cracks on a low-angled face, I chose to start by climbing the arete and remained on the arete for the most part. I found this route very enjoyable!
You can plug gear, taking some larger gear in the fist size cracks, or TR the climb. Two bolt anchors await the climber at the top.