Failed plug
I have since found another engineer who also thought sparkplug blanks
were indeed machined from screw stock (i. e. resulfurized or leaded
free machining steel alloys). That would still suggest a possible raw
material fault. I certainly wouldn't want any plugs made from that
particular bar.
Be sure you save it. I'll bet you could exchange that plug with its
manufacturer for a new one...........!
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