Quoting%20commentary for Moed Katan 3:4

אֵין כּוֹתְבִין שִׁטְרֵי חוֹב בַּמּוֹעֵד. וְאִם אֵינוֹ מַאֲמִינוֹ אוֹ שֶׁאֵין לוֹ מַה יֹּאכַל, הֲרֵי זֶה יִכְתֹּב. אֵין כּוֹתְבִין סְפָרִים, תְּפִלִּין וּמְזוּזוֹת, בַּמּוֹעֵד, וְאֵין מַגִּיהִין אוֹת אַחַת, אֲפִלּוּ בְּסֵפֶר (הָעֲזָרָה) עֶזְרָא. רַבִּי יְהוּדָה אוֹמֵר, כּוֹתֵב אָדָם תְּפִלִּין וּמְזוּזוֹת לְעַצְמוֹ, וְטוֹוֶה עַל יְרֵכוֹ תְּכֵלֶת לְצִיצִיתוֹ:

Writs of indebtedness are not written on Chol Hamoed, [since they can be written afterwards.] And if he does not believe him [and does not want to lend him money without such a writ, and the debtor needs the money] or if he [the scribe] does not have what to eat, he writes it [and he takes his wage, this being permitted to one who, otherwise, would not have what to eat.] And not one letter is corrected, even in the scroll of the azarah (the Temple court), [which the high-priest read on Yom Kippur, even though this is a communal need]. R. Yehudah says: One may write tefillin and mezuzoth for himself [to fulfill the mitzvah, but not to sell or to rent], and he may spin tcheleth (the purple-blue thread) on his thigh for his tzitzith [by placing it on his thigh and rubbing it with his hand so that it is spun of itself. But not with his hand between his fingers and not with a spindle as he does on a weekday. The halachah is that one may spin tcheleth for his garment both with a spindle or with a stone.]

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