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A magnetically restrained stainless steel band completely covers the opening through which the actuator operates. The ball coupling is of a new design which prevents forces, generated through parallel or angular offsets, from being transmitted to bearing surfaces. Due to the design and the selected materials the temperature coefficient of the transducer is extremely small. Careful attention to detail and choice of materials has resulted in a transducer with an extremely low temperature drift. The robust design ensures reliable operation even under harsh environmental conditions such as vibration or temperature changes.