displaced on the flyer bow and form a loop in the wire which would cause the wire to break if the loop should catch on any structure located near the flyer bow to avoid this displacement by windage it was necessary to operate prior art twisting machines with more tension in the wire in order to make the bow 40 suitable for use on conventional twisting machines the bow 40 has rectangular end portions 78 which are the same as those of conventional flyer bows these rectangular end portions are obtained by having the groove 70 extend for only a portion of the length of the bow 40 the extent of the groove 70 is across the major portion of the bow 40 and across that part of the bow with which the conductors 14 and 16 contact the ends 78 have the usual fastening openings 80 which are part of detachable fastening means for securing the flyer bow to the upstream and downstream rotors 24 and 30 respectively fig1 the tension on the conductors 14 and 16 can be controlled by the amount of torque applied to the takeup spool 34 by the motor 56 the reduced wire tension required by the grooved structure of the bow 40 for preventing displacement of the wires 14 and 16 by windage is one of the outstanding advantages of the present invention increased tension in twisting machines.