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Viking Husqvarna Clearance Buttonhole Reed Plate – 4131056-01 - Fits 1-7 This Clearance Plate will work with ALL Husqvarna Viking Sewing Machines which groups 1 through 7. The Clearance Plate creates a thread shank when sewing buttons in place. Each end is a different thickness for more or less thread shank. It also can be used when sewing over heavy seams to balance the height of the foot.