This tool is used to secure the rod while performing the reaming operation. 1937-1940 WS. 1937-1942 WLD. 1941-1944 WLC. 1940-1945, 1950-1951 WLA. 1937-1942, 1944-1951 WL. 1937-1940 W. 1938-1940, 1945-1948 US.