Hi, I have been working on designing something for a clutch. The clutch plate is pressed against the pressure plate using a belleville spring. The belleville spring is connected to the clutch pedal using a linkage with leverage. I came across a graph that describes the displacement of the linkage (this value divided by leverage will give the clutch plate movement) and the force at the linkage at that point. The graph is attached. As you can see, the mechanism needs totally a different pattern of forces to displace the clutch between new and old. Especially when the clutch is new, the curve is flat at some place and climbs up again. For an old clutch condition there is no flat portion as such and there is a drop of force after a displacement of 12 mm. Can someone pl explain why this happens? Thanks.