Slob: I think the theory is that with 6 cups and springs there is the possibility for the pressure plate to move outwards on its splines at an angle or more likely as the clutch is released and the pressure plate starts to bite on the stack of plates for the spring cups to wander around the post causing the pressure plate to cam into the splines on drive take up. By effectively connecting the cups together rigidly it limits that possibility. Probably that is complete bollox.
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