The device used for treatment was returned for evaluation.The reported problem was visually confirmed.The snap-lock nut is sheared off at the collet.In addition, a visual inspection was performed on the part beyond the reported complaint.The snap locknut is the old version without the pin.Although the reported problem was visually confirmed, a functional evaluation was performed and failed the handpiece test with a t1 value of 98.The device met all specifications upon release into distribution.A complaint history review for similar reported/confirmed complaints associated with the handpiece and failure mode(s) "error message(s)" identified similar events.The most likely cause of this event is the mechanical failure of the snap lock.As a part of corrective actions, more robust design of the snap lock has been released.
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