I want to put 72inch white bamboo blinds in an area - 4 of them I got from Home Depot -didn't realize they are cordless - Unfortunately, I need to place them 12 ft high - any way to add a cord to roll down? They come with these little clips that I am supposed to manually roll up and clip to keep in place. I have seen others with a crank, but those are $$$$ - I only paid $25 for each of the ones from Home Depot - searched Amazon, internet; can't find old fashioned cord roller shade....