and 24b vent holes 42 44 and 46 are provided in the jets respectively these vent holes pass excess air flow from the jets if the back pressure in the guide tubes is too high for a particular set of conditions similarly there is a clearance gap 48 where the converged tubes 26 26a and 26b enter guide tube 40 so excess flow due to back pressure in tube 40 can be vented without such vents the elongated condition of the yarn may not be maintained and any excess back pressure may stop the forwarding and create a plug of tangled yarn or any excess back pressure may momentarily blow the leading end of a cut yarn in a reverse direction in the guides or jets during reintroduction of the yarn to the textile apparatus this venting technique may be useful with any of the jets used in any of the embodiments if back pressure downstream of the jet produces problems when feeding an individual yarn end through the arrangement of fig4 it may be useful to energize several or all of the jets 24 24a and 24b when introducing an individual yarn to provide ample air flow through the common guide 40 in general then the.