Reference for Kelim 14:8
מַפְתֵּחַ שֶׁל אַרְכֻּבָּה שֶׁנִּשְׁבַּר מִתּוֹךְ אַרְכֻּבָּתוֹ, טָהוֹר, רַבִּי יְהוּדָה מְטַמֵּא, מִפְּנֵי שֶׁהוּא פוֹתֵחַ בּוֹ מִבִּפְנִים. וְשֶׁל גַּם שֶׁנִּשְׁבַּר מִתּוֹךְ גֻּמּוֹ, טָהוֹר. הָיוּ בוֹ חָפִין וּנְקָבִין, טָמֵא. נִטְּלוּ חָפִין, טָמֵא מִפְּנֵי נְקָבִין. נִסְתַּתְּמוּ נְקָבִין, טָמֵא מִפְּנֵי חָפִין. נִטְּלוּ חָפִין וְנִסְתַּתְּמוּ נְקָבִין, אוֹ שֶׁפָּרְצוּ זֶה לְתוֹךְ זֶה, טָהוֹר. מְסַנֶּנֶת שֶׁל חַרְדָּל שֶׁנִּפְרְצוּ בָהּ שְׁלֹשָׁה נְקָבִים מִלְּמַטָּן זֶה לְתוֹךְ זֶה, טְהוֹרָה. וְהָאֲפַרְכֵּס שֶׁל מַתָּכוֹת, טְמֵאָה:
A knee-shaped key that was broken off at the knee is pure. Rabbi Yehudah declares it impure because he can open with it from within. A gamma-shaped [key] that was broken off at its gamma (shorter) arm is pure. If it had the teeth and the gaps it remains impure. If the teeth were removed it is still impure on account of the gaps; if the gaps were blocked up it is impure on account of the teeth. If the teeth were removed and the gaps were blocked up, or if they were merged into one another, it is pure. A mustard-strainer in which three holes opened up in its bottom, and they merged into one another, is pure. And a metal mill-funnel is impure.