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the stops aren't the same, you can't myo separating zip with those parts

-Tim

i think the 2 zippers system is good enough to be worth a try, it is cheaper than custom, no min to buy and will weigh the same anyway so no reason as long as you can seal the gap. You could still...

your idea of a zipper that opened on each end would be perfect as the sliders would meet in the middle but like you said it would have to both be custom made and me made to the exact length needed as...

yeah, the only way to have zips in the center is with 2 sep zips, but i now realize they could be 2 1way zips instead of 2 2way

-Tim

so i just tried the 1way with 3 sliders as that is the only way to have 1 long zip that can separate and still have 2 sliders meet in the center, but i can't get all 3 sliders to slide onto the...

http://www.owfinc.com/images/zipperpics/2way%20sep%20zip.gif

Here is the image of what i am talking about. No reason it can't be shortened

-Tim

a 2way, like on a jacket, has 2 sliders that are back to back, one closes as you zip it up and the other opens as you zip it up. this is what allows you to have your jacket zipped in the middle but...

i guess i don't understand why you can't shorten a 2-way separating. If you take length off the top and add a new stop why would that affect the way the zipper works? 2 sliders start at the bottom...

4 separating zips is an idea that is interesting. I have been thinking about how to have 1 hammock that can be taken with net, sans net or sans net with over cover. I want to build this feature...

you can absolutely shorten separating zippers

-Tim