Once you are satisfied that the pleats and spaces are evenly marked draw a line with a fabric pen or pencil down the length of the buckram and at right angles to the top edge at each pin marker. For valances that are to be attached by Velcro. Cut lengths of Velcro the width of each space. Pin one piece across each space close to the top edge. Backstitch in place along all 4 sides being careful not to take the stitches through to the right side.
Machine stitch down the full length of the pleat i.e. the width of the buckram.
Remove the tacking stitches. Place the curtain right side up on a flat surface. Squash the base of each pleat just below the buckram to form 3 smaller pleats. Be careful not to squash the goblet. Using strong matching thread sew through all thicknesses to form the base of the goblet.