the thread f as a result of this the thread is protected and napping is prevented it has proven practical for the depth of the grooves 32 to be about one half as great as the width of the grooves 32 so the thread can be lifted out from this groove 32 with only a slight pull since the tension jolts and the friction acting on the thread are low the quality of the thread does not suffer to prevent large jumps it is useful to arrange many grooves 32 along the perimeter of the attachment 33 if possible so the longitudinal differences and the jumps of the thread f are slight fig6 shows another embodiment in which the spindle attachment 33 on the end facing the thread guiding element 1 has a collar 36 with grooves 35 that protrudes from the shaft diameter of the attachment 33 with regard to their orientation and length the grooves have been adapted to the geometry of the course of the thread they run inclined towards the turning axis of the attachment 33 and cut through the edge of the collar 36 formed by the front part 34 and the mantle at an angle u03b1 this angle u03b1 is determined by the centric exiting from the thread guiding element 1 and the course of the thread under which the thread f reaches the edge of the collar 36 provided with grooves 35 these grooves 35 have a rectangular cross section but they form a triangle in their longitudinal section the apex of this triangle catches and holds back the thread f guided through the edge f 2.