MB3 146a: Sponges on Shabbos (320:14-18)

Spreading a kerchief over a barrel. Wiping something with a sponge is prohibited on Shabbos because squeezing is inevitable. What if it has a handle?

Plugging a hole with linen is a פסיק רישא דלא ניחא ליה unless you want the liquid that comes out