Perforator was returned for evaluation: dhr - there is no indication that the production process may have contributed to this complaint.All test results passed procedural specifications.Failure analysis - visual inspection utilizing the unaided eye performed.The unit was lightly soiled on the visible surface but was heavily soiled on the inside of the unit once the sleeve was removed.Unit also had a worn label.Spring test attempted, the inner / outer drill were fused and unit initially failed the spring test due to the very limited compression using downward force.A test hole was conducted to try and free the inner / outer but was unsuccessful.At this point the unit had the sleeve removed showing significant organic matter caked inside - this is likely the cause of the frozen inner / outer.The unit was then soaked in 70% ipa for 3 hours, and the organic material was removed.Once cleaned the unit was re-sleeved and passed the spring test as designed.Functional test performed once unit was re-sleeved and passed by successfully drilling 5 holes with no issues.In conclusion although the unit initially failed this was due to the "dried" organic matter freezing up the inner / out drill.The organic matter would not have frozen the drill at the time of surgery.Unit passed all tests post-cleaning therefore, the complaint could not be verified.Root cause remains undetermined.Product was received for analysis and the analyst could not confirm the complaint condition.
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