Secure the quilt back to the floor, or table, make the quilt sandwich. Slip the marble under the quilt back and gently roll it to the place that you are going to pin. I always start in the center. The marble holds the quilt up just enough to let you insert the pin without scratching the table or pinning your quilt to the rug. Just roll it to the next pin placement as you baste. It really works well, and it is so much easier to pin when the quilt is just a bit higher than your surface.