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Originally Posted by ekam
I thought we have dual-mass flywheel which is not servicable? That's not if the OP changed to an aftermarket flywheel previously.
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Generally that's true. The traditional lathe/cutter tends to 'skip' on the flywheel surface leaving it 'choppy' and ruining the cutter. Some shops have done it, but most will not and Porsche does not recommend it. But, the flywheel should be cleaned up assuming it's not warped or hot-spotted.
Just like a brake pad and rotor, the clutch deposits a layer of the friction material on the flywheel surface and it's this friction material-to-friction material contact which makes the best bond. ScotchBrite or even 80 grit sandpaper will clean the old material off the flywheel surface so the new clutch can lay down a new layer as it 'beds-in'.