If you can get your hands on Harriet Hargraves Heirloom machine quilting book she gives a good description with pictures on how to do it on a smaller table using those spring loaded vice grips. I did an 80" square quilt that way on my sewing machine table with the machine down in its little hidey hole and it worked pretty good. You baste an area, unclip then move it over and baste another section.