gently flatten the tube to find the 12:00 and 6:00 points.
our circle and tube are a nice even fit, but if you feel you need additional help to get a smooth set-in end cap, you can run a gathering stitch around the entire outer edge of the tube, staying within the standard ½" seam allowance. gather up the circle just slightly, leaving the thread tails long so you can adjust the gathers as needed.
place the circle into the marked end of the tube, right sides together, matching up the 12:00, 3:00, 6:00 and 9:00 marks on both pieces. pin at these four points first.
adjust the fit as needed, either tightening 