How can I make a configurable joint behave like a spring joint?

Hi, I am trying to recreate the spring joint using a configurable joint so I can have more control over the joint. A lot of the properties that a spring joint has don't seem to appear on the configurable joint.
I am setting up the joint through a script, so I would like to change as little properties as possible.
So how can I recreate a spring joint using a configurable joint? Thanks!