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One of the most vital products in my sewing studio is "Make-A-Zipper".
Economical and easy to use, I just measure the length of zipper I need and snip it off. One peril of using it, however, is over-zealously zipping the zipper pull off the zipper!
After much forehead slapping and abandoning perfectly good zippers, I came up with the following way to rethread a zipper pull.
1. Separate the zipper tapes
Just pull the tapes apart - they should separate fairly easily.
2. Get 2 strips of masking tape
I usually make mine around 2 to 2 1/2 inches long.
3. Make masking tape tabs
This is the important step. Carefully line up one side of the masking tape along the outside edges of the zipper teeth, making sure to leave about three-quarters of the tape hanging off the end. Then fold the masking tape back on itself to the other side of the zipper, creating a little tab. Now do the same to the other side of the zipper.
4. Thread one side of the zipper
Thread the zipper tape through one side of the zipper pull. You'll feel the teeth click as they enter the pull. I usually slide 2 or 3 teeth into the slide.
The tab is helpful for this step. Tugging firmly but gently, thread 2 or 3 teeth through the other side of the pull.
6. Start zipping
This is where you'll see the tabs in action. Firmly hold both tabs in one hand and pull on the zipper pull with the other. You may have to change the angle of your zipping hand slightly to get the pull to move. Try wiggling your hand around and soon you'll start feeling the zipper pull zipping.
7. Hurray! Your zipper is happily re-threaded!
Now take a look at your re-threaded zipper. Your zipper tapes may be misaligned a little bit. If that's not a problem, then sew away! If this is a problem, start the process all over again. But you're a pro at this now, so it will only take a few seconds!
Note: I've only tried this method with nylon coil zippers. I'm not sure if it would work for zippers with molded plastic coils. This technique also applies only to zippers without a zipper stop.
Let me know if you have any questions or if this tutorial is helpful. I know I'm thrilled with my home-made niddy-noddy!