What Makes Your Ssissth Kosher?
Part 1: Find out how many strings you need and of which color. The Sifray says to sew the ssissth directly on the tallith – in contrast to present practice of making a hole. Two holes are better than one. Techelet was not discovered, it was here all along.
Part 2: Three different answers regarding the number of blue strings. Rashi and Tosafot agree on an approach, but they fail to prove their case.