I have those but have only used them on a large crib quilt. Stopped the other day at a friend's mother's house. Didn't know she quilted. She uses the only machine she has ever had. It's a Singer REd Eye and beautiful. What I found her using was she carefully rolls the edges of the quilt then puts a 2 ft piece of trim molding on top and on bottom of each side. She then uses the large clamps (black w/red grips) to keep them in place. By doing it like this there are no clamp impressions on the quilts. The trim molding is the vinyl that has been prepainted. Paint doesn't come off. She said she's been doing it like this for years. She does some beautiful quilting.