[s-cars] Clutch disc with sprung hub for aluminum flywheel

[Theodore Chen]

I bought a Sachs Race Engineering aluminum flywheel and pressure plate from a fellow lister, for AAN.  I also picked up a B5 S4 clutch disc with sprung hub, based on the info from the UrS4 forum on the Audiworld site.

Now my mechanic is telling me that the new clutch disc won't fit with the pressure plate, because its hub (with the springs) is too large to fit inside the inner circumference of the friction surface in the pressure plate.  He said it's close.  The hub is 149mm, and the pressure plate's inner diameter is 148mm.

I don't know if the ID of my new pressure plate is smaller than stock, or if the hub of the clutch disc is bigger than it's supposed to be.

Anybody run into this before when trying to switch over to a sprung clutch disc?

-Teddy