What You’ll Need:
Tensioner (Already attached to cord loop)
Screw
Drill
STEP 1. Pull the cord as tight as you can toward the windowsill without damaging or straining the window coverings.
STEP 2. Place screw through hole.
STEP 3. Drill in the screw until the cord tensioner is securely fastened to the wall or window frame.
STEP 4. Check the tension in the loop or chain. It should be taut. Recheck the cord tensioner for stability.