Buzzy: Studies that have been conducted to explore options for patients with Carpal Tunnel Syndrome demonstrated that some tissues, to include ligaments, will adapt to constant traction by permanently lengthening.
Since some of the techniques that men use to lengthen their penis are, in effect, methods of stretching the supporting ligaments, I propose that their reported success results from stretching these tissues to allow more of the penis to extend from the body. However, it would take a significant amount of time to produce this result.
For disclosure, I have been applying traction to my penis for about three hours/day over the last few months. The weight program was given to me by my surgeon after undergoing penis enlargement surgery. So, all of the gains in length that I have seen to this point may simply be a result of the surgical procedure.