How to pull a double zipper

To clean up any foreign material, dip a cotton swab in water and wipe the Zipper clean, or apply wax to the zipper to reduce friction between the zipper and the cord. You can also remove the Double Sided Zipper Pull and replace it with a new zipper.
1. Clean up stains
Double Sided Zipper Pull is likely to be blocked by foreign bodies. Dip a cotton swab in water and wipe the inside of the double zipper to remove the foreign bodies. This will reduce the friction.
2. Apply wax oil
Double Sided Zipper can be daubed with wax. Rust on the double zipper may also cause it to have more friction with the shuttle. Apply wax evenly to the double zipper, then close the shuttle again and try to Pull, but if it cannot be pulled, continue to daub.
3. Replace the zipper
Zipper change can be done by removing the top part of the cord, then removing the Double zipper from above, then installing the new zipper from above and fastening it with tweezers.