Hi granny dee,
I have just finished making 22 Roman blinds( as we call them here in the UK ) and I found that the following method worked very well for me. My machine is a Bernina 1230 and I used the foot that I use for sewing on buttons with a close zig-zag stitch and the feed dogs dropped. One of the blinds was made of pure silk, 8 feet wide and required 30 rings which all sewed without slipping.
I hope that this will be of some help. Edwina.