Dog clutch skids on the main shaft to rotate with it. Many of the gear over the layshaft is fastened with it.  Once the still left-hand dog clutch is brought to skid into the remaining in the gearshift lever, it messes with the clutch gear, along with the upper-speed gear https://gearboxauto75297.blogripley.com/34471459/the-definitive-guide-to-gearbox-auto