Responsa for Menachot 83:10

איכסיף אמר ליה רב אשי לא תתקיף לך חד מינייהו כתרי מינן

is equal to two of us'. R'Aha B'Jacob used to take four threads, double them over, insert them through the garment, and then make them into a loop;<span class="x" onmousemove="('comment',' Having doubled over the threads he used to insert the looped end through the hole in the garment an inch or so and then pass the ends of the threads through this loop and pull tight, and in this manner the threads hung from the garment. ibhgcs huvhks ohkhsd khsd');">¹¹</span>

Teshuvot Maharam