Lack of maintenance or defect

Broken distributor rotors is not something I ever see.  So when it occurred to the gray door stop, it came as a bit of a surprise.  I don’t know if it was a defective part or maybe it’s my lack of attention.  I’m usually pretty good about maintaining all the vehicles.  But having to take care of 2 4AGEs I may have changed one, but not the other.  Luckily the breakdown was less than a mile from home.  It was just a long walk.