So you're just replacing an existing SRL with a new one in zing-it? I thought you were looking into one for a new DIY hammock. If it's just a replacement then it would depend on what the current SRL is done in. Ie., how big is it and how much stretch is in the existing? If it's comparable in size and type to zing-it then you should be fine to just measure it out 1:1. If it's heavier cordage but the same material then you might need to subtract a bit off your zing-it SRL to compensate for a bit more stretch... or the opposite might be true if the existing SRL has more stretch to it than zing-it. KWIM?
If you're talking a new DIY then there would be a number of factors to consider since the materials and measurments wouldn't likely be exactly the same as any of your existing hammocks. For the "commercial" hammocks they are pretty much "dialed in" and can get away with a fixed SRL because the materials, measurements, cordage diameters and type are all identical. Change any one of those factors though and some adjustments might be necessary.
That's why I suggested an adjustable SRL to start with since it's likely a little tweaking an inch or three or more one way or the other might be necessary on a DIY project because any one or more factors might yet be unknown and not identically comparable to any existing hammack you might own.
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