Screwfinder allows construction boards to be dismounted and carefully removed without them breaking and without excess dust. Screwfinder is a spring-loaded device with a magnet on the tip, which is used for finding screws and joists in plas- ter and other boards mounted on walls and ceilings. When the magnet finds a screw it is sucked onto the screw, then tap gently with a hammer to mark/remove the screw. Then screw the screw out with a screwdriver. The dismounted boards can then be reused.