Here is a tutorial that shows how to turn a separating zipper into a closed end zipper.
Separating Vs Closed Bottom Zippers
Is it possible to convert a zipper with a stop at the bottom to a
Turn a separating zipper into a closed end zipper tutorial
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4pcs Lampo 4.5 Zipper - Non-Separating (Closed-End) Zipper
Separating Vs Closed Bottom Zippers
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