Very cool, I have one of the pre-aged Flyer models on another bike, it came with the lacing, heard of people trimming them but never seen one, interesting, and I don't mean that negatively.It is to remove excess material and remove sag from seat works wonders. A brooks seat is adjustable, but can be stretched out to a hammock.
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After doing this on an old one; I would definitely do it on a new one of mine.
I probably should have PM you these pics. Sorry to hijack thread. Mods can remove if they wish. No disrespect.