Commentary for Menachot 80:10
אמר רבא השתא בבל תוסיף קאי מעשה לא הוי
Do we then always apply the rule 'Thou shalt make, and not use what is ready made'? Surely R'Zera has said that if a man inserted fringes in a garment that was already provided with fringes,<span class="x" onmousemove="('comment',' A second fringe was inserted at each corner close to the existing fringe, and when all eight fringes were attached, the first set of four fringes were cut away.');"><sup>15</sup></span>
Tosafot on Menachot
It is involved with [violating] "do not add"; it is not considered an action: As since he transgressed a prohibition, it is not considered an action; so [only] at the time of the cutting of the first [strings], is it the making [of the second strings]. So it is not similar to that [case] in the first chapter of Sukkah 11a, in which we do not say their cutting is their making. And this requires [further] investigation.
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