This cart show up at a training session, and the owners had a problem. The judge at the previous test deemed this cart unbalanced. How could an empty cart be unbalanced? Upon further inspection, it was noted that the shafts on this cart were particularly heavy, and thus, it put a substantial amount of weight in the front of the cart (in front of the axle). To balance this cart, we added a counter weight. That might seem odd, but we added the counter weight BEHIND the axle, thus, balancing the cart on both sides of the axle.
The best way to do it would have been to measure the weight of the shafts, and then to add that exact weight to the back section of the cart. This was a quick way to solve the issue for now.