Unique device identifier: (b)(4).Device history record: the dhr shows no abnormalities related to the reported failure.The mayfield skull clamp (a3059) was returned for evaluation: the reported complaint was confirmed via inspection of the unit, with the lock having up and down movement and the teeth were grinding when rotated.General maintenance and cleaning is required.No further investigation required based on the acceptability of risk and no adverse trends identified.This will be monitored and trended going forward.
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