I am not sure if your feet number are the same as mine. The #5 foot is called a blind stitch foot whihc I never used. I just recently looked at my Bernina feet and discovered from this board that the #20 is an open toe applique foot. It appears that the #10 foot is "superbly suited to applying lace and trims, Edgestitch foot # 10 is also ideal for topstitching edges, pleats and hems". I use the #37 foot for accurate 1/4" piecing.