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I have never seen a resurfaced dual mass flywheel that worked, and taking one apart is just not economically feasible, which is why they are replaced when they are no longer flat. Most attempts end up with an uneven surface or kill the elastomeric material and defeat the purpose of the dual mass.
Jake has a valid point on the disc, some aftermarket discs are thicker in the hub area than the OEM units and cause no end to problems, which are often very difficult to diagnose. If it is not an OEM disc, or had not been checked against an OEM disc before installation, I would consider looking there and checking that flywheel for trueness as well......
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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