Tosafos R’ Hershel Schachter

From here: https://www.mywesternwall.net/2019/04/02/techeiles-how-to-tie-tzitzis-like-r-hershel-schachters-method.html

Use three long strings: 2 blue one white, with the last white regular length. While this can be done with two regular length white strings, it’s very difficult there to keep the length level since the white string is used for 6 winds (3 before and 3 after).

Another thing I do is to not only tie the four strings on one side, but also any strings I’m not using at the moment. To start I will tie two of the other four on the other side as well.

Also important is that for tying the initial knots you say “הריני מתקשר לשם מצות ציצת,” and each individual knot afterward you say “לשם מצות ציצת.” When tying those knots the tradition is right-over-left first, then left over right (since we show preference to the right). If you need to cut strings it’s preferable to use ceramic or wood scissors – as long as it’s not metal since that traditionally was used for implements of war and bloodshed.

The first chulya is three white, then switch to one of the Tekhelet shamashim for the last four blue. After I tie the strings, I add the white Shamash I previously used to the two other strings tied. I won’t need it for the next little bit.

Chulyos 2-5 are the same techeiles shamash string. I personally like to switch to the other techeiles string for chulyos 6-7 as the length for the first techeiles shamash has more or less been used up.

For chulya 6 I untie the white shamash string and new techeiles shamash, and tie up the other two. I then wind chulya 6 like 2-5.

For chulya 7 it’s like chulya 1, but in reverse: 4 blue, 3 white. Once that’s done, here’s the tricky/fun part. While holding the white string with two fingers so it doesn’t unravel, you need to now untie all the knots you created. Then, somehow maneuver the blue strings all on one side and white strings on the other side. After that, tie like the Ittur, which means holding the white strings straight while fold/wrapping the blue strings, then holding onto the blue strings straight and wrapping the white.

From Ptil:

The Gemara states that a Chulya is comprised of 3 twists. It then goes on to say “not less than 7 and not more than 13.” It is unclear if this statement refers to the number of Chulyot, or if it arguing with the previous assertion – namely that a Chulya should be between 7 and 13 twists instead of 3. Rav Schachter takes the stringent position to accommodate both options, having 7 Chulyot, of 7 twists each.