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There's a limit to the angle a knife-edge pivot can cleanly function. On the left: the knife edge (blue arrow) rests in the V of the pivot stud (black). Press the bar too far (rear of the bridge plate lifts up), and the top of the knife edge contacts the stud. This levers the sharp edge out of the V, and abrades the sharp edge. When the bar is releases, the worn edge returns to the V pivot, but the now-damaged/deformed knife edge has a larger contact area, accelerating wear and causing creaking, clicking and other issues.