Abstract: The invention relates to a yarn processing system S with a textile machine T, a carrying device P, comprising a round cross-section or square cross-section clamping profile 1 and at least one yarn feeding device F, fixed to the clamping profile, which yarn feeding device fixation has a cut-out 5 and at least one detachable clamping element 7 for mounting on the clamping profile, wherein the cut-out of the fixation B of the yarn feeding device F is either selectively changeable between a round configuration and a square configuration or is embodied to be suitable for both cross-sections.