Jim, Tightening the spring is very difficult and can cause damage and/or injury. You have to have enough tension/torsion in the lift the entire awning assembly. It has to be adjusted while the awning is in the stored position, and takes a couple people. I have done it on a manual awning, when re-building it, but cannot remember the exact process. I believe it involved holding the keyed stud that goes into the upright arm, and then removing it from the upright arm(allowing you to tighten the spring, and then re aligning the stud and re-installing the upright arm. We used a pair of vise-grips while standing on a ladder. each turn of the stud gives you one more revolution of the awning roller during retraction.