The 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 unaided eye performed, unit was soiled, and had a destroyed eo label.Organic material between the inner / outer drill.Spring test attempted; unit rotated fine but the spring would not compress from organic material present.Unit was freed by drilling 5 test holes, then passed the spring test and functioned as designed.Functional test performed.Five test holes were drilled to free the inner / outer and allow the spring to compress.Once freed the unit successfully drilled 5 additional holes and was found to function as intended.Complaint could not be verified.Unit was found to meet all acceptance criteria.Therefore the complaint condition could not be confirmed.Root cause - the root cause is undetermined and was unable to be confirmed in the complaint evaluation.
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