Thank you for your post. I was quilting last week and noticed my plastic tracks were shredding as i quilted. I was near the end of the quilt so I finished. Then came to quilting board to find my answer about the tracks. I had looked online to buy them but shipping cost was more than the tracks. After reading your post I called our local machine shop and took them pictures of my frame and took my IPad with me to read them these posts. They mostly do oilfield welding but were willing to help me. They ordered the 1/4” stainless steel rods for me, got them in and cut them to 99 1/2” and I set them on the Gracie II frame tracks and it works so smoothly. I appreciate all of the posts from everyone.