Carefully measure the fuselage and find the middle point at landing gear or firewall. Place a pivot at this point and hold the plane at the fin so it will be level. See how much weight is needed to laterally balance your plane(try not to force the plane to either side while holding it at the fin). It is an easy job............probably will need some help to hold the plane in place during process.
Before balancing my Funtana this way it snap badly every time I pull hard on ele.
Hope this help......

Marcos