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To subscribe at no charge, submit a Newsletter Subscription Request . Idler A benefit of SpaceAge Control position transducers is they measure displacement when the application is not necessarily moving in a straight line or when the position transducer cable exit axis is not in line with the application movement axis. The Idler was designed originally for aircraft applications. The Cable Guide was developed in response to automotive applications where there was limited motion in three dimensions. This is the case in vehicle crash testing where it is difficult to predict in which direction the monitored item might deflect.