Zippers break for all sorts of reasons, especially if they are subject to a lot of pull and pressure. Before you set out to get a new zipper or even think about donating or recycling that garment, see if you can fix your zipper yourself. Some problems look tough but are easy enough to solve at home.
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how to repair broken zipper? : r/fixit
A Tailor showed me this Method! How to Fix Broken Zipper 
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[request] how to fix a broken zipper? : r/lifehacks