I have a quilt on the frame now that I am doing and leaving the side borders the do when I turn it and attach the sides to the top leaders. I have done this before because it is easier to do the pattern in a continuous run. --- After the body of the quilt has been quilted, I attach the sides to the top leader and leave the rest to hang over the front of the frame. It is now stable and I just clamp the right and left edges and finish the border. My frame is only 103" wide and it is quite tight at the edges on a queen size.