of tube tape.
cut three pieces of cord. the first piece should be twice the length of the window plus the width of the window. the second piece should be twice the length of the window plus half the width. the third piece should be twice the length of the window.
starting at the bottom about three inches from the left edge, pass the longest cord through the loops in the tube tape. tie it off near the end and use a dab of glue to secure the knot. then continue passing it through the loops going straight up the back of the shade. it helps to use an upholstery needle to 