One last suggestion. Go to Home Depot or Lowes and purchase the largest dowel they have. Have them cut it in half. Them have them make it as long as you want it. Mine is 14 inches long. I place my seam on it and start with the point of my iron in the seam and press down the seam. Taking your time and pressing open the seams on many quilts makes them look so pretty.
Have a great quilting day!