Abstract: In a textile yarn twister, means for mounting idler pulleys and the drive tape tensioner spring transversely across the width of the twister between its opposing spindle rails resiliently. The pulleys are rigidly supported by and are interconnected with a transverse beam positioned between a pair of opposing spindle assemblies, the beam being vertically interconnected with each of the spindle rails by a resilient, vibration damping, isolation mount. Shock absorber elements are horizontally interposed between the transverse beam and the spindle rails to prevent shearing of the isolation mounts upon start-up or stoppage of the twister. Adjacent transverse beams are rigidly interconnected by elongate rigid members spaced away from the spindle rails to provide, in all, transverse and longitudinal stability of a plurality of the present mounting means relative the spindle assemblies associated therewith.