To properly install an invisible zipper, you must have an Invisible Zipper Foot. As the zipper coils are guided through the tunnel system, the needle sews as close the coils as possible.
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This 1/4 w/ Guide Presser Foot is ideal for patchwork. The guide on this foot helps to sew a perfect straight line. This presser foot is an 'Old
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BERNINA Invisible Zipper Foot #35- BERNINA