Prepare and clean the area around the damaged seam by removing broken thread and trimming any loose threads.

Prepare the damaged seam by placing the fabric edge to edge.

Place the item under the sewing machine, and make a short back-and-forth lockstitch using the reverse lever, to secure one end. Then proceed to make a single long stitch along the seam until the end of the damage. Secure at the end with another locking stitch. Inspect the repair, and if it requires another long stitch, repeat the process.

Tip: check the iFixit basic sewing skills page for more tips on sewing machine setup.