On both sides, fold the raw edge under one inch and pin. Bring the folded edges around the poles to form sleeves and pin. Remove the poles and sew along the folded edge and reinforce with another row of stitching about one-half inch inside the first line. On the bottom, fold the edge up four inches and place sinkers, evenly spaced, two inches above the folded edge. Carefully bring the folded edge up around the sinkers to meet the raw edge and pin.
Reposition sinkers along the bottom edge and pin in place to avoid shifting.
Sew along top edge through all four layers and sew around sinkers to form pockets. On the top, reduce the width to about ten inches between the sleeves by gathering and pinning fabric. Sew one quarter to one half inch from edge through all gathers and reinforce with another row of stitching. Place one rubber band on each pole just below the bolt and slip poles into sleeves. Cut a small hole in the bottom of each sleeve to allow tip to protrude about 1.5 inches.