I have recently make some flat roman shades for a friend. They are made with a cotton stripe fabric and lined with blackout lining. There are 6 rows across and 5 rings down, that I hand sewed ( I did not use the ring tape). When I went to install the shades you could see where I had sewed all the rings on The sunlight shined through. I have remade them over again with a regular lining and you can still see little holes where the rings have been sewed on. I am at a complete loss with this. My friend is not happy with this and neither am I. Do you have any suggestion or will your book be able to assist me with this.