Quote:
Originally Posted by 911pcars
Clutch chattering can also be caused by hard spots on the flywheel/pressure plate surface. If "resurfaced" with a regular lathe bit, the tool simply skips over the hardening hot spots. This results in an uneven friction surface.
Some suggest using a resurfacing process that instead uses a grinding wheel.
Sherwood
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When I rebuilt my 915 I took it to DeJung Motorsports and I remember him telling me that he had to send the flywheel to a machine shop that specifically does Porsche work. he mentioned that the resurfacing process was different so maybe this is what he was referring to?