If everything is intact, you’ll want to pull the slider up until locked track teeth are in sight at the bottom. Then sew a new stop at the bottom of the zipper tracks. Zipper teeth repair ...

Unfortunately, you can’t really fix this problem permanently unless you completely replace the zipper. That said, there are ...

I can rebuild it! He thought. I have the technology! He was off to design a new box in OpenSCAD and had sturdy ABS replacement zipper box in no time. He installed it with dab of Duco cement ...