Reference for Shabbat 20:1
רַבִּי אֱלִיעֶזֶר אוֹמֵר, תּוֹלִין אֶת הַמְשַׁמֶּרֶת בְּיוֹם טוֹב, וְנוֹתְנִין לַתְּלוּיָה בְשַׁבָּת. וַחֲכָמִים אוֹמְרִים, אֵין תּוֹלִין אֶת הַמְשַׁמֶּרֶת בְּיוֹם טוֹב, וְאֵין נוֹתְנִין לַתְּלוּיָה בְשַׁבָּת, אֲבָל נוֹתְנִין לַתְּלוּיָה בְיוֹם טוֹב:
R. Eliezer says: The mashmereth, [which filters wine lees] may be suspended on a festival. [It is stretched taught in a circle over a vessel. And even though it forms a tent, this is permitted on a festival, R. Eliezer holding that processing of food which could have been done on the eve of a festival may (nonetheless) be done on the festival. But on Shabbath, he may not suspend it ab initio.] And they may be placed into a suspended one on Shabbath. [If it were already suspended, it is permitted to place wine lees on it for filtration, for this is not the usual mode of borer (selecting).] And the sages say: The mashmereth may not be suspended on a festival, [for he thereby makes a temporary tent, giving the impression of mundane activity]. And they may not be placed into a suspended one on Shabbath, [this being a toldah of borer or meraked (sifting). The halachah is in accordance with the sages.]