The tale of the $350.00 distributor

That's from wear, one of the reasons I change them bet that washer was like a hulahoop on there. Here is a pic of a late model shaft you can see the spiral groves up the shaft that carries a bit of oil to lube the bushings, that plastic washer keeps it in the shaft area away from the points, the cup style have a 1/8" hole into the bushing and felt in the tube to wick the oil on the shaft so no top washer is needed the oil travels down in that case.