This section is from the book "The Boy Mechanic Vol. 2 1000 Things for Boys to Do", by Popular Mechanics Co.. Also available from Amazon: The Boy Mechanic, Vol2: 1000 Things for Boys to Do.
The annoyance of a shade that will not run true on the roller and flops in the wind coming through an open window can be overcome by using guide wires as follows:
The stick in the hem on the lower edge of the shade is supplied with a screweye, A, at each end. A wire is run through the screweye and fastened in a vertical position on the casing with screweyes as shown by B, B. A second wire is similarly attached on the other side of the shade, taking care to have both wires parallel and true with the ends of the roller. - Contributed by George Lue, San Francisco, California.
Ill: Two Parallel Guide Wires Hold the Stick of the Shade in Its Proper Place