b33/b35 Zipper foot
Due to the narrow shape, zippers in various versions can be sewn in easily. The fabric is fed evenly while you can sew along the coils very closely.
When using sewing feet that can only be attached on one side, the zipper is always to the right of the presser foot. In this case, sew the zipper from the start of the zipper to the end. Then turn the sewing round and sew the other side of the zipper in the opposite direction.
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