21 fig5 shows a further embodiment of the invention whereby the fibre guiding surface 22 comprises a cylindric trough shaped cavity fibre guiding surface before the diverting point 17 is plane the trough shape of the fibre guiding surface 22 results in a concave fibre presenting edge 6 1 the front surface 21 of the fibre presenting edge 6 1 is also shown as one can also see in the further fig5 a and 5 b illustrations of cross section of fig5 in this exemplified embodiment of the invention the front surface 21 is essentially vertical to the fibre presenting edge 6 1 and or to the yarn guiding channel 8 the front surface can however comprise other shapes as is shown in fig6 a the front surface 21 can be vertical with a straight presenting edge 6 but it can however also comprise a convex form 21 1 as is shown in fig6 b or as in fig6 c comprise a concave shape 21 1 in fig6 b and 6 c embodiments are also shown where the fibre presenting edge 6 and the front face 21 do not possess the full width of the fibre guiding element 3 c according to the invention the width of the fibre guiding element 3 c close to the fluid device 13 can converge conically so that the fibre presenting edge 6 and the front surface 22 2 and or 22 2 comprise only the width g compare with fig6 a the invention is not explicitly limited to the specified possibilities and embodiments.