"This servo was positioned near the wrist and could be used to reverse the polarity of a magnetic seal. In 2371 Data used this technique to open a hidden door in the Amargosa observatory. (Star Trek Generations)"@en . . . "This servo was positioned near the wrist and could be used to reverse the polarity of a magnetic seal. In 2371 Data used this technique to open a hidden door in the Amargosa observatory. (Star Trek Generations)"@en . "Axial servo"@en .