An easy way to fix the broken sheath that keeps the turning controller for a window blind attached. The small slit in the sheath allows it to fit over the metal connector, then just turn about 90 degrees to either side to keep the metal piece from falling back out (which is what happens on every turn if you are missing said sheath). My only comment is that the sheath pictured was only 10 millimeters tall and the file is for one 15 millimeters tall as mine turned out a little shorter than I would have preferred.