UPDATED: Sliders are very tight. I found that the way they installed was literally the opposite. Pass the coils through the wider holes and slide them towards each other inside the slider; When stretching the zipper, pull the sliders to the uncut length of the zipper. (see pictures). It's very cumbersome (a lot of swearing followed here), but it works. I received a full set of 80 sliders. Haven't measured the lightning myself, may need to go back and upgrade if it's less than the 50 meters I paid for.
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