The center electrode on iridium and many platinum plugs is so thin that:
If you gap them, they will break.
That was a bad joke from "Field of Dreams", for those who aren't paying attention.
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"¿ʞɐǝɹɟ ɐ ǝɹ,noʎ uǝɥʍ 'ʇı ʇ,usı 'ʎlǝuol s,ʇı"
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