Tap- 9-32 Winchester mainspring (hammer spring (mainspring)) screw

This is the near impossible to find 9-32 tap that Winchester used on all of the lever-action (1866, 1873, 1895, 1894, 1892) and pump .22 (1890, 1906, 62) mainsprings. This is a very high quality 4 flute tap with a surface treatment.