Checking and adjusting balance on a DMF is a job for a skilled specialist -certainly not me !
John Edwards of Costa Mesa R&D did mine.
"The final issue is that if the clutch/DMF assembly wears and runs out of balance it can cause severe engine damage by overloading the crankshaft main bearings. This problem is especially prevalent on the 986, 987, 996 & 997 2.5, 2.7, 3.2, 3.4, 3.6 & 3.8 models, For these reasons Ninemeister highly recommend replacing the Porsche DMF at the same time as a clutch replacement and will only warranty a clutch package when fitted with a new DMF."
The whole story is here:
http://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/schaeffler_2/symposia_1/downloads_11/4_dmfw_1.pdf
&
http://www.schaeffler.com/remotemedien/media/_shared_media/08_media_library/01_publications/automotiveaftermarket/poster_1/downloads_29/luk_dmf_poster_de_aus.pdf
I hope this helps
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