10100 Spring, Main Shaker Spring used on the RD-20, RD-40, RD-90, RD-150, WM2000 and the Nordberg CV-40 screeners.10100 Main Shaker Springs, used on the RD 20, RD 40, RD 90, RD 150, WM2000 and the Nordberg CV 40 model screens. This will be item 10 in the parts diagram Disclaimer; Online Power Products has no connection with Read Screen All or with any parent company of Read Screen All. Online Power Products is not associated with Read Corporation nor do we represent Read Corporation, the parent company of Read and or any other entity. Part numbers used are only