When Can Double Knots be Untied On Shabbat| Halacha of Matir

Rabbi Yosef Shusterman is a renowned halachic expert and authority in Jewish laws. He is the Rav of the Chabad community in Los Angeles. He is a member of the Vaad Rabbonim Lubavitch and sits on the Bais Din. Because of his knowledge of complex and difficult halachos, he receives halacha question from all over the world.