(b)(4) the device was return for evaluation.The device history record showed no abnormalities related to the reported failure.The investigation of the returned device did confirmed the reported complaint.The returned unit did not meet all specific functional test.The unit was received without the adjustment wrench, the received with the 6" transitional member was not fitting in the lock handle casting, a result of closing the lock handle without a transitional in place which caused the lock handle hole to egg shaped.The observed condition was likely caused by wear and tear/ improperly handling of the device.The definite root cause cannot be reliably determined.
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