The last part on the outside of that diagram is a bellville washer (spring) and puts a small preload on the spring pack. To see what it has you need to measure the stack height (need micrometer, depth mic, etc) and see how much that spring is collapsed. As the packs wear you loose preload quick because of the short travel length and it needs to be reset. The ramps only work when both wheels are touching pavement so you now have wheel spin over the bumps.
Steve Eckerich
ITS 18 Speedsource RX7
ITR RX8 (under construction)
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