MB3 112a: Shaking off a Rock or Money from a Barrel or Pillow on Shabbos (309:4)

Removing a rock from a barrel or money from a pillow on Shabbos by shaking it. Removing the muktzah item to protect the muktzah item. What if you can't tilt the barrel? Using a table on which there is a muktzah item. A muktzah item left on a table, etc. during bein hashmashot.