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The problem is the variation in the number of friction plates, their friction coefficient, spring strength (old/new?) and whether the clutch is run completely dry (as with many belt drives) or has to cope with primary oil splash for there to be a single ideal measurement in my opinion, as a totally dry clutch, for instance, would require less clamping force so could be run with a higher stack height (so flatter spring) than one having 'wet' plates.