I have one somewhat like it. The boards sit on stands and held together with C-clamps. I don't use leaders but pin thumb tacks to attach the backing on to the boards then add the batting and finally the top. I pin the two opposite side first then adjust the board making it taut then repeat with the other two sides, it is not an easy process but I learned it at the Mennonite Quilt Center. I use mine when I tie a quilt. You quilt or tie all four sides and when you can't reach anymore you the unpin a portion of the board that are on the bottom and roll the boards that are on top with the quilt ( this is a two person job) until you reach the place that needs quilting. Repeat the process until you are finished.