Reference for Kelim 14:2
מַקֵּל שֶׁעָשָׂה בְרֹאשׁוֹ מַסְמֵר כְּמִין חַזְיָנָא, טָמֵא. סִמְּרוֹ, טָמֵא. רַבִּי שִׁמְעוֹן אוֹמֵר, עַד שֶׁיַּעֲשֶׂה בוֹ שְׁלֹשָׁה סְדָרִים. וְכֻלָּן שֶׁעֲשָׂאָן לְנוֹי, טְהוֹרִין. עָשָׂה בְרֹאשׁוֹ מְנִיקָת, וְכֵן בַּדֶּלֶת, טְהוֹרָה. הָיְתָה כְלִי וְחִבְּרָהּ לוֹ, טְמֵאָה. מֵאֵימָתַי הִיא טָהֳרָתָהּ, בֵּית שַׁמַּאי אוֹמְרִים, מִשֶּׁיְּחַבֵּל. בֵּית הִלֵּל אוֹמְרִים, מִשֶּׁיְּחַבֵּר:
A staff that he attached to its end a pin like an adze is susceptible to impurity. If he studded it with nails it is susceptible to impurity. Rabbi Shimon says: [it is not subject] until he makes three rows. In all cases if he put them in as ornamentation the staff is pure. If he made a tube on its end, and so also in the case of a door, it is pure. If it was once an independent vessel and then it was fixed to the staff, it remains susceptible to impurity. When does it become pure? Beit Shammai says: when it is damaged; Bet Hillel says: when it is joined on.