Review on AIEVE Closing Wrench Tension Replacement: Achieve Efficient Closure with Ease by David Naranjo

FYI to increase the tension to close the door, turn the Allen key toward the door. I have a set of five small pens. They were actually smaller than I needed, but they worked. I was just careful not to push them all the way into the loop so I could adjust. It takes a few turns to reach the desired tension. Just install the pin, take the hex wrench and reinstall. Then pull the pin to start another rotation.