Sentence:  A Lockheed Type 6 remote <WSD>servo</WSD> adds a 1.9 multiplier to the pedal pressures and, at about £140, is rather cheaper than all the Girling single line remote <WSD>servos</WSD> I′ve seen advertised. 
Meaning of the word marked with <WSD> tags:  A servomechanism or servomotor.