I don't remember of them reconditioning plug's, but when plugs were sent back they would look at them and aslo cut them apart to see what was happening in side. Then sent the person new plugs in return. But in your case when the plug was no longer built and it worked good for you the engineer would clean them and test them and then return them. Champion wanted to make sure the racer was taken care of in the old day's . Take care, Mike
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