As a somewhat non-related data point. I was told to worry about all the things that are being discussed in the thread when I chose to install a solid flywheel in my GF's MCS. While not a light weight unit per say, it is not as heavy as the stock DMF. I guess that I was luck as none of the horror that was predicted came to pass... It works beautifully. I only have about 10K on the install, but so far so good...
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