Reference for Menachot 78:3

ורב סבר לעולם פתיל בעינן וההיא גדילים למניינא הוא דאתא גדיל שנים גדילים ארבעה עשה גדיל ופותליהו מתוכו

[the fringe] may be either [entirely] a twisted cord or [entirely] in loose threads. Rab, however, maintains that there must always be loose threads; but the expression 'twisted cords' is required only for the determination of the number of threads; for the expression 'twisted cord' would imply two threads,<span class="x" onmousemove="('comment',' For a twisted cord cannot be made of less than two threads.');">⁴</span>

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