A template is made from two pieces of board measuring about 1" wide by 6" long. The two pieces are glued together with PVA mixture. The measurement of this template that will be of use to us is the thickness. The template is placed on edge at roughly a 45 degree angle across the corner, and the cloth is trimmed along its outer edge. This yields a cut two board thicknesses from the extreme corner of the board. All four corners of the cloth are trimmed following this procedure.