How should I tie Tekhelet on my tzitzit?

There are different opinions regarding how Tekhelet should be tied. Bear in mind that the technique chosen does not qualify/disqualify the mitzvah, except for certain minimal requirements. Today, Tekhelet is being tied following the opinions of various legal authorities including the Vilna Gaon, the Rambam, the Sefer HaChinuch, and Chabad.