First of I have an 8ft Owl electric screen, gain 1.2, vinyl material, hung by a heavy metal bar on the base. I am only projecting a 61inch wide image. The screen is 92inch wide. I currently have one screen edge butted up against the image but only on one side, leaving 31inch gap of white vinyl on the other, I hang a black cloth on this side but I do not get the sharp black edge from this method. Due to the nature of the metal rod design there is very slight curl at the edges. Instead of swapping to a smaller screen which would have slight curl at each end I have been thinking about using the centre flatest part of the screen and then blanking the left and right. I would like to make some sort of blanking that produced sharp black edges left and right. Has anyone done this and what products are used? Could I paint the screen black at the left and right edges? Would the method of using only the centre of an oversized screen be a better alternative to a very expensive screen that has gone to great lenghts to flatten the edges?