of the jet the venturi may be moved from a string up position to an operating position between positive set points engaging the movable venturi located within the jet application_number US 53631483 A description referring to the drawing the major elements of the jet device are body 10 yarn guiding element 12 movable venturi 14 with its attached collar 16 and baffle 18 with its supporting bracket 20 attached to body 10 yarn guiding element 12 is press fitted into body 10 at the inlet end of the jet and consists of a cone shaped entrance 13 in communication with the yarn exit orifice 15 of the yarn guiding element the outer portion of the yarn guiding element comprises a cylindrical portion 17 with a conical tip 19 fluid orifice 22 has its axis parallel to the axis of yarn passage 17 and is supplied with fluid such as compressed air through fluid connection 23 venturi 14 is free to move axially within the body 10 and a seal is formed between the venturi and body by o ring seal 24 seated in an annulus 25 in the body the venturi 14 is press fitted into collar 16 and collar 16 is free to move within the recess 26 at the outlet end of the jet body a circumferential groove 28 is formed in collar 26 a rod 30 extends through body 10 and engages groove 28 the rod is rotatable in both the body and the groove a handle 32 is attached to the end of the rod so that the rod may be easily rotated the rod is not completely circular but has a flat sided cut.