#9046, "RE: Spec Stage 3 - Shakes at idle" In response to In response to 14
I was thinking about this the other day, and I'd venture to guess why they won't balance it. The disc spins inside the clutch, so if they balance the assembly as it sits, as soon as the disc moves, it can be back out of balance. Especially if the disc itself has a piece missing and is off balance.