Use the edges of the foot for accurate 1/4" piecing The inside of the toes provides an accurate 1/8" seaming guide The foot has 1/4" markings both behind the needle and in front of the needle for accurate pivoting of corners For very delicate or difficult fabrics, consider the use of a straight stitch plate (Models 130-180, Models 1000-1630) in combination with Foot #37 for maximum fabric control.