It remains to be seen if it can be repaired by hand. A special sewing machine is required, as opposed to using a regular sewing machine. The document you linked is about garment production, not repair.
How things get repaired is not up to the original company in most cases. People are inventive when they need to be.
Almost anything that can be sewn together by a machine can be sewn together by hand too. That said, sewing doesn’t do much for most zipper failures anyway, which are usually broken teeth or sliders.
How things get repaired is not up to the original company in most cases. People are inventive when they need to be.
Almost anything that can be sewn together by a machine can be sewn together by hand too. That said, sewing doesn’t do much for most zipper failures anyway, which are usually broken teeth or sliders.