I just hung mine about an hour ago with industrial strength velcro from Home depot. I bought something called velcro extreme, and put one in each corner. They measure about 3 inches each. I also bought some regular industrial strength stuff, like 8 feet of it, and am watching the screen to see if it does anything funny. If it doesn't ill take this stuff back. The extreme stuff was like 4 dollars.
My screen is 73x41 with 2 extra 41 inch planks in the middle. 1.5"x1.5" wood.