an adjustable base for supporting a selected one of a plurality of needlework frames of different sizes includes an h - shaped structure and slider plates which are receivable in the end recesses of the h - shaped structure , each slider plate carrying a support arm which is attachable to an end of the needlework frame . when changing from one frame to a different frame of a different size , the slider plates are easily adjusted in or out to vary the distance between the support arms to accommodate the new frame .