This diagram shows how the blind stitch sews in relation to the fabric and the presser foot. Note the guide in the center of the foot – this rides along the fold as the needle stitches into the hem allowance (straight stitches) and zigzags into the garment. With a permanent guide like this one, the needle position is adjusted as needed for proper stitch placement. Many blind hem feet have a moveable guide; with these the guide and fabric are moved to adjust the “bite” of the stitch.
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