Our kitchen window seems to be an odd width (117cm), so any of the standard widths in the shops would need altering. The closest I can find is 122cm. I've bought cheap roller blinds before, and just cut the material myself with scissors (even using sewing scissors, so the blades are better and longer), but the material frays at the edges. We're getting our kitchen changed, and I want something that looks nice and not tatty. Any ideas how they could be done more neatly?