I found when I pin the sandwich, it is too difficult for me to quilt. The pins drag and get stuck on me, the sewing table, and on each other- this causes problems including puckering. Now I only baste the sandwich with needle and thread. It takes a little longer but it eliminates many problems for me. Plus the sandwich is much lighter and easier to move. The best is when I baste with dissolving thread- when I wash the finished quilt the basting is gone. Hope this helps.