Reference for Eduyot 3:5

הַקֶּלַע שֶׁבֵּית קִבּוּל שֶׁלָּהּ אָרוּג, טְמֵאָה. וְשֶׁל עוֹר, רַבִּי דוֹסָא בֶּן הַרְכִּינָס מְטַהֵר וַחֲכָמִים מְטַמְּאִין. נִפְסַק בֵּית אֶצְבַּע שֶׁלָּהּ, טְהוֹרָה. בֵּית הַפָּקִיעַ שֶׁלָּהּ, טְמֵאָה:

A sling whose receptacle [(where the stone is placed)] is woven, is tamei. And one of leather — R. Dossa b. Hyrcanus rules it tahor, and the sages, tamei. If its finger-hole, [where the finger is placed to fling the stone], is severed, it is tahor; if its handle, it is tamei.

Jastrow

Jastrow