Reference for Shabbat 117:1

הואיל וראוי להקישו על גבי חרס

[The reason is] because they<span class="x" onmousemove="('comment',' The bells that had their clappers removed. ');">¹</span> are fit for beating on an earthen utensil.<span class="x" onmousemove="('comment',' Then they produce a bell-like sound just as when they have a clapper. Hence It is a utensil like before, and so remains unclean. But when the parts of a shears or of a plane are separated, they cannot be used at all. ');">²</span>

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