Some more important concepts about "SHEMA YISCHOK" (one might come to squeeze out a garment).
floor Drain with Hinges or Handle, Shelf in a Bookcase with Hinges, and the Use of a High Riser or Sofa Bed on Shabbos;
Introduction to Combing or Brushing One's Hair on Shabbos;
Removing a Nail, Screw, Thumbtack from One's Heel (Bottom of Their Shoe);