an annular ring assembly is provided in which mechanical elements of the retaining ring assembly maintain strict planar flatness , rigidity , high tolerances and surface stability control . additionally , glues , adhesives , and epoxies are eliminated from the construction of the plastic retaining and backing ring assembly . further , adverse chemical reaction and contamination from adhesives that are typically in direct contact with chemical slurry and substrate layers undergoing polishing are eliminated . as a result , the present invention provides a low cost alternative to suppliers and manufacturers of retaining rings and facilitates a method to exchange , recondition and recycle the retaining ring for an infinite period , thus reducing consumable waste materials . further , the ring assembly maintains uniform mechanical properties and strict tolerances after post reconditioning , thus reducing the variability and maintaining process consistency .