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MB3 30b: How to Properly Remove a Pot from Muktzah and Non-Muktzah Insulation on Shabbos (259:2-7)
Items that are normally muktzah such as rocks must be designated before Shabbos for use as insulation. What if the muktzah item wasn't designated?
Insulating for Shabbos when Yom Tov falls on Erev Shabbos.