You’ve made the threaded parts and are confident they are okay because you’ve checked them with your gages. Then you get the call from the customer advising you that their gages have rejected the parts and they are demanding re-work or replacements ASAP.
Explaining to the customer that you’re certain the parts are good because your gages had been recently calibrated and found to be okay does not impress. Your customer advises that his gages have been calibrated recently as well and were found to be within spec. Now what?