Hi, I was looking to make my own screen, but instead of making a fixed screen like many others, i wanted to make one that looks like a roller blind. I'm going to buy 1:1 gain material from drh. Anyone know where I can get the roller casing that is used in roller blinds, so that I can attach the screen material to that and just use it like a regular roller blind. I don't want to have to buy a normal roller blind. Just the actual casing and roller mechanism. Obviously you can see i'm on a tight budget.