Reference for Kelim 13:5
מַחַט שֶׁנִּטַּל חֲרִירָהּ אוֹ עֻקְצָהּ, טְהוֹרָה. אִם הִתְקִינָהּ לְמִתּוּחַ, טְמֵאָה. שֶׁל סַקָּיִין שֶׁנִּטַּל חֲרִירָהּ, טְמֵאָה, מִפְּנֵי שֶׁהוּא כוֹתֵב בָּהּ. נִטַּל עֻקְצָהּ, טְהוֹרָה. שֶׁל מִתּוּחַ, בֵּין כָּךְ וּבֵין כָּךְ טְמֵאָה. מַחַט שֶׁהֶעֶלְתָה חֲלֻדָּה, אִם מְעַכֶּבֶת אֶת הַתְּפִירָה, טְהוֹרָה. וְאִם לָאו, טְמֵאָה. צִנּוֹרָא שֶׁפְּשָׁטָהּ, טְהוֹרָה. כְּפָפָהּ, חָזְרָה לְטֻמְאָתָהּ:
A needle whose eye or point was removed is pure. If he fixed it for stretching [a garment] it is susceptible to impurity. A pack-[needle] whose eye was removed is still susceptible to impurity since one writes with it. If its point was removed it is pure. A stretching-pin is in either case susceptible to impurity. A needle that has become rusty: If the rust blocks it from sewing it is pure, but if not it remains susceptible to impurity. A hook that was straightened out is pure; if it is bent back it resumes its susceptibility to impurity.