Karl, don't get too wrapped up in bigger numbers for springs, most users need * alot * of time to build up wearing times/increased grams of pull. If you just use what comes with it, you will get a lot of use.
but the spring does give you more of a pull .
and i no that my penis is ready more it . i have been working it out for over 7 months now i also hang.
i just tought tat a harder pull would have been that bit better for me