To reduce the drive power consumption of a circular knitting machine by reducing the contact area of a tool for the knitting machine with the side faces of a thin groove to suppress a rise in temperature and the thermal deformation of the knitting machine by frictional heat. A first step comprises manufacturing the guide rail in a configuration in which the guide faces, compared to their intended final position, are spaced apart further through an imaginary rotation around a part of the connecting web; a next step comprises moving the guide faces towards the intended final position. A stream manager may determine whether a dynamic connection exists at a first stream operator.