With the tool, you need to remove it and work the corners by hand. I can do a decent job all on the machine now!
It really makes a huge difference if you starch your binding fabric before you begin, and press the binding away from the quilt before you stitch the back side.
It makes a neat, quick, secure binding that is perfect for any quilt that will see a lot of use.
I will still do hand binding on my "good" quilts, but this gizmo worked great for the 10 antique quilts I finished for my sister-in-law.
In fact....I timed the last one I did (after practicing on the other 9!) and was able to cut the binding, piece and press the strips in half lengthwise, attach it to the front of the quilt, press it away from the quilt and stitch in the ditch to secure the back edge of a 75"x75" quilt in less than 90 minutes!!! I was impressed with myself!!