Abstract: A rack for holding the sides of a flat-sided plastic napkin holder vertical while the bottom of the holder is being molded. The rack includes a wire basket of generally box-like shape with vertical sides and a bottom formed from segments of stiff wire. In addition to the wire basket, the rack includes a rectangular sheet of relatively stiff, resilient polyethylene which is held fast at the middle by the bottom of the basket frame so that the halves of the sheet extend upwardly and press outwardly against two of the basket sides to give it a U-shaped profile in side view. The wire basket has three short legs to support it firmly on the rim of a mold for casting the bottom of the napkin holder. To use the device, preformed sides of the plastic napkin holder are forced between the two halves of the polyethylene sheet and confronting sides of the wire basket so that the pressing halves of the sheet hold the napkin holder sides in position against the basket without slippage.