There is such a product, marketed by and for people who have no knowledge of the Halacha. Such ????? are absolutely ???? because of the rule of ???? ??? ?? ?????. Suppose you have a garment has three corners, and you attach ????? to them, and then modify the garment so that it has a fourth corner. ???? ???? says clearly that you will need to untie the three ????? which you had attached prior to the garment having had four corners, and put them on again (???? ????? points out that this means they must be completely untied).
