The device was returned for evaluation.Upon further inspection, the heli coil was out of the thread, therefore the index knob was tight to move to lock or unlock.The device history record (dhr) shows no abnormalities relate to the reported incident found nor were there any variances, mrr¿s or reworks associated with this lot/work order number.The complaint event is confirmed.Root cause is unknown, however the most likely reason, is parent thread had a raised indication formed by an electrical arc / rack mark, most likely caused by an insecure electrical connection between rack and power supply used by anodize supplier.The suspected small pin hole sized indication most likely prevented the helicoil from fully seating allowing the helicoil to work loose.
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