Troubleshooting

a) When the opening and closing is not smooth, if the chain head is pulled forcefully, the teeth will can't align with each other. At this time, wax or lubrication spray is applied to the surface and inside of the teeth parts, and then the pull head is moved several times after sliding loose.

b) The zipper on the bag when things are loaded too much, if the zipper is closed, the force of the zipper is too large, it will make the teeth out of the belt.  Pull the teeth of the two sides of zipper together so that make the slider easy to pass through.

c) When opening and closing the zipper, sometimes the chain head bites the line segment or fabric and the slider does not move. In this case, if you want to pull the slider, it will bite deeper and deeper. When fully bitten in, do not pull slider,unfasten the fabric as you push the slider back slowly.

d) When the clothes are worn for a long time, it is not easy to use the zip pulling, because the slider becomes loose. At this time, you can grab the slider with the pliers and pinch it tight.