<human>:  How do I repair a broken zipper on my jacket?
<bot>: To repair a broken zipper on a jacket, you will need a handful of common tools. You'll need needle-nose pliers, a seam ripper, a thimble, a small piece of fabric or leather, some heavy-duty thread, and a piece of wax paper. Begin by gently pulling out the broken teeth of the zipper with the needle-nose pliers. Carefully slide the thimble over the new zipper and onto the fabric or leather. Sew the teeth together with the heavy-duty thread, making sure to use a secure, close stitch. After you have sewn the teeth together, cut out the excess material with a seam ripper. Lastly, sandwich the zipper in between two pieces of wax paper and press with an iron to help the stitching settle and adhere.