The years show an assortment of devices used to hang curtains and shades. Multiply this by the number of windows, then X 2 for each side of the window. That will give you an idea about the number of spots to repair. Oh, you also need to multiply the number of screw holes times the number of hangers too! Mercy. Many of the windows had treatments at the midpoint on each side. Screws, nails, tacks or brads, all had to go and holes to fill. Hi ho, hi ho, off to work we go.