I think cabers should be thought of as wheels with two spokes: there has to be a center of rotation. The run gives the forward motion to get the wheel spinning. The heavy upper end will assure that the wheel goes forward and starts the spin when you stop. The long and heavy cabers require the field experience, the technique and the strength to make this wheel simile work. With your little 2 x 4 you can easily see the spinning wheel concept when you toss it hard enough to spin twice before hitting the ground. What you want to simulate with the caber is a wheel turning only 270 degrees.