Things You'll Need
Instructions
Cut the duct tape to measure 7 inches. Cut a second piece of tape to measure 3 inches. Press the sticky side of the short piece of tape to the sticky side of the long piece, centering the short piece.
Stick the ends of the long piece of tape to the top arch of a doorway, creating a pulley.
Measure the height of the doorway arch and double it. Subtract 2 feet and use that measurement for the length of twine. Pull the twine through the pulley, leaving both ends hanging at an even length.
Let the two magnets grab each other on either side of one end of hanging twine to create the crane.
Scatter the nails and washers below the crane. Let the magnets pick up the nails and washers by pulling the no-magnet end of twine. Manipulate the magnets to move the nails and washers into the box.