The clutch disc is held together with rivets. Once the friction material is worn out the rivets can contact the metal surface of the flywheel and/or pressure plate and score the metal surface.
If the pressure plate gets scored it does not matter, because a clutch kit included a new pressure plate. If the flywheel gets score, then it is resurfaced or replaced. Some shops will not attempt to have a flywheel resurfaced. That means a new flywheel and retail is $900.
You might want to do a clutch replacement now.
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