Tension Springs

Has anyone modified their Dobsonian with something similar to the Orion
Correct Tension system? I have a Celestron Starhopper 11" and need to come
up with some kind of tension adjustments as balance while switching
eyepieces is an issue. What type of springs did you use and where did you
find them. How did you attach them to the scope? Any additional info or
pictures you could provide will be appreciated. Thanks.
John