Stephan,
On an original, unmodified shaft, all of the shims are required so that the pully nut will not reach the end of the threads on the shaft before tightening against the stack of shims and the pulley. If more than two or three shims are left out of the stack then the nut will contact the unthreaded portion of the shaft before contacting the pulley/shims. This is a common cause of stripping the nut/shaft.
-Mark
70 911E
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