If you look towards the rear of the track their should be a torsion spring on both sides. The front arm is long and is bolted to the suspension. The back arm is short and rests on a triangle. This triangle is the cam that you heard about. To adjust it you need to take the spring pressure off of it and rotate it so that the arm of the spring rests on a different edge of the triangle. This will make quite a huge difference to the ride stiffness but can be a pain to adjust.