The method mentioned above by using a cup hook at CG point from info plane kit are arf, really works best as you can also balance wings tip to tip when hanging plane. I built an 12 ft wing span Decathlon and I balanced it using top of wing as balance point. When we flew it i was tail heavy. Turned plane upside down and transfered CG piont to bottom of plane , reblanced it , and it took almost 4oz of lead to make it blanced right. We flew plane and it flew great.