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A few years ago a fellow club member was having trouble with chatter after installing a new clutch.
The flywheel was surfaced along with the pressure plate assembly being rebuilt and surfaced. It also had a new one of the good clutch disks with the caged springs.
The engine and clutch was out of the car for the third time before discovering that the cause of the chatter was a slightly raised area (bump) about the size of a nickel on one side of the clutch disc.
Just something to check.