I have started putting safety pins down the center of my backing, on the right side, stretch out on the dining table put center of batting along the pins, pin down the center of quilt top. I then smooth out to the sides, clamp them to the table. I feel for the pins on the down side of the backing and pin down the center. After I have it all pinned together, I flip it over and take the pins out of the back. A little more time spent but, It makes it easier to pin and makes the backing fit better.