RW Backlash Free Elastomer Couplings Servomax Ecolight are functional as the wear free and fatigue resistant solutions, available with an infinite service life. We offer them in various tolerances, materials and dimensions. They are functional with advanced performance ratings and are suitable for several applications. RW Backlash Free Elastomer Couplings Servomax Ecolight allows for automatic re-engagement. They have an elastomer insert and transmit the force without vibrationor backlash.