How to put the zipper back if it falls off: Use a seam ripper to remove the sutures at the end of the zipper, both sides, and then use needle-nose pliers to open and remove the metal hinge.
Remove the slider from the zipper. If it cannot be removed, use pliers to open it. But this is very likely to damage the teeth or zipper. Then carefully install the new slider. Before pulling the slider up, pass the zipper through the upper opening of the slider and then pass it under the slider. Pull the slider up until the closed teeth appear at the end.
Sew at least six stitches at the bottom of the zipper, making sure to sew under the slider, and a new hinge will be formed. Once the metal hinge is removed, it cannot be put back on, but a few stitches can replace the hinge. Sew the zipper back on. Sew the zipper back the way it was originally removed. This step is over. The zipper is now secure and the slider moves back and forth smoothly.
Zipper maintenance tips
1. During daily use, pay attention to whether there are "broken belly", "out of teeth", "skew" and other problems on the zipper. If there are these problems, you should Repair it promptly and stop deadlifting. If the zipper is loose and detached, you can use a small hammer to gently tap the zipper head a few times to make the upper and lower chain teeth bite tighter, so that the zipper will no longer be detached.
2. Aluminum alloy zippers are more susceptible to corrosion, so they should be kept dry and away from moisture to prevent the aluminum teeth from forming white oxides, which will cause the zipper to rust over time and affect its use. Also be careful not to come into contact with alkaline and acidic substances.
3. Do not overfill any zippered bags, pockets or wallets.