Protein complex forming the elongated portion of the radial spoke between the base which binds to the A-tubule of each microtubule outer doublet and the neck which connects to the spoke head within the ciliary or flagellum axoneme. [ http://www.ncbi.nlm.nih.gov/pubmed/34871179 GOC:krc GOC:hjd http://www.ncbi.nlm.nih.gov/pubmed/22754630 ]