this operation the rotary movement of the shaft 13 is followed only by the pulleys 6a and sleeves 6 this is because the pressure of the fork 12 on the flange of the wheel 8 and the possible resting of the head of the extension 2b of the shaft 2a against a fixed stop 11 lock the shaft 2a and prevent it being dragged by the rotation of the sleeve 6 consequently the sleeve 6 changes its position relative to the shaft 2a to arrive at the position shown in fig2 and 4 in this second position the eccentricity of the pin 2 is much less as seen heretofore in relation to the description of fig4 so that each of the wire guides is now able to make a rotation over a circular trajectory of a much smaller diameter this rotation in a circle of very small diameter enables each of the individual wire guides to twist or wind the end of the winding on the respective coil terminal after positioning means not shown have moved the coil support to bring the relative terminal into a position coinciding with the axis of rotation of the wire guide without interfering with the end of the coil a new twisting operation is carried out with the same reduced eccentricity after again moving the coil supports to make the initial terminal of a new coil coincide with the axis of rotation of the wire guide the.