why should i write in here if details are optional?
I think this what you needhttps://www.instructables.com/id/Reverse-Sliding-Knot-for-Bracelets/
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To describe which knots of the hundreds out there you want. Or at least offer where to find a pic of what you want.
This will do it - http://www.bellaonline.com/articles/art4277.asp