I have managed to increase my gerth through this routine. With an erect penis I jelgue to the halfway point or where I fill the head is full enguoged holding at that point I then squeeze and kengel holding for about 5sc then I release, repeating about 150 time per session.

Check out this video of me jelquing it might be of use
http://www.youtube.com/v/4CzHxjrRmTI