As the friction disc wears the clutch gets heavier. I'm sure it's to do with the change of angles of the pressure plate fingers requiring more force as "moment" has altered. You'll notice that when you fit a clutch and tighten the pressure plate bolts the fingers move toward the flywheel, on a worn plate they assume a position nearer the release bearing/slave, the angles have changed.
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Cheers from Trevor
MM0KJJ
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