I'm prepping the windows for the installation of new blinds tomorrow—remove old hardware, clean, spackle, paint. The old hardware was installed by the previous owner, an EE. He mounted these curtain brackets with 1.5-2" nails hammered directly into the frame around the window. 4 holes, 3 different nails. The only weight they held was the sheers. Now I have considerably more plaster to repair than I had hoped. Fortunately, my boys weren't around to hear me cuss.