a rotary printing screen , for mounting in a rotary screen printing machine , which has a support member at each end of its screen cylinder . the support member uniformly supports each endring against the longitudinal tension applied to the screen cylinder by the tensioning device so that the endrings remain in parallel . the support member , made from a heat - shrinkable plastic , such as polyethylene terephthalate , is selectively a heat - shrunk plastic sleeve or a heat - shrunk device endwise extension of the screen cylinder . each embodiment extends over at least a portion of the shoulder of the endring to form a lip which has progressively greater thickness and decreasing circumference , terminating in a circular bead . as a sleeve , the support member fits over each terminal portion of the screen cylinder and covers its adhesive joint with the underlying cylindrical surface of the endring .