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In spite of how BAD it may look, those distributor wear (worn?) patterns are actually quite typical...even back in the points & condensor days. Today's higher-voltage systems "eat" metal slightly more than in the old days.
One "trick" to SLOW (but never can STOP) such "pitting/erosion" is to lightly wipe each metal surface (cap studs as well as rotor arm) with dielectric (silicon) grease.
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