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MB3 132b: Double Knots on Shabbos (317:5-7)
Tying a bow on Shabbos is permissible, even tightly. Making a bow on top of a knot is permissible if intended to be temporary. Tying a necktie on Shabbos. Using a weavers rope on Shabbos. Tying a cow's rope to a trough on Shabbos. Making twine on Shabbos.