Just going by memory-no guarantee, as if there ever is:
I think there is just a nut in the center of the front of the clutch, this is removed and the part retained by the nut is pulled of the hub. The shims are located on the shaft the nut screws on to.
One exception, and I had a question like this on one of my Mercedes TRP tests, and got it wrong: The shims are added to close up the gap, and removed to make it larger. Sounds strange, but I believe this is true. Easy enought to find out I guess, if you have some feeler gauges, check it out.

Gilly