To use, mount the chipboard next to a door using tape or pins. Tape the string to the door. When the door is opened, it will pull the tab out of the c...
Step 4: Step 2
Measure 1½ inches along the strip and draw a line. Cut off the 1½ inch piece of chipboard and punch a hole about ¼ of an inch from one end of the short piece of chipboard. Tie one end of the string around the hole.
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