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MB3 108b: Rocks, Beams, Unfinished Hides and Bones on Shabbos (308:22-27)
To use a block of wood as a cover or to hold a door, it needs to be designated for that use before Shabbos, otherwise it's muktzah because it's not their normal purpose. Is it enough just to designate it for this use for Shabbos only? Verbal vs. mental designation. Using a tree branch cut off before Shabbos. Dried animal hides on Shabbos.