For the propagation of the rotary twisting from a thread section (Gb) in a thread guide (2) into the entwinement point (E) of an open-end spinning apparatus with a spinning element (10) provision is made in the longitudinal extent of the thread guide (2) for a a thread contact surface (41), to which surface a vibration element (40, 40a, 40b, 40c, 40d) is supplied. The thread contact surface (41) possesses a polished surface and is part of an inlet element (21) on the thread inlet end of the thread guide (2). The vibration element (40, 40a, 40b, 40c, 40d) is connected to a control system (5), with the aid of which the frequency and/or the amplitude of the vibration generated by the vibration element (40, 40a, 40b, 40c, 40d) can be made to match the current operational phase and/or the current rotational speed of the spinning element (10) and/or the fiber material to be worked.