At first I didn't understand how to zip up. But lots of YouTube videos demonstrating the basic idea helped me figure it out quickly. You simply pull out the top connector and insert a new one by squeezing the new connector from the top. It's clear. I ended up fixing more old zippers than I originally planned. Good. I can't say anything about the "strength" because the new zippers were installed about 2 months ago. So far, so good.
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