For the one picture is worth a thousand words types, Here's my 100 cc 25 lb. extra on the balance rig. By sliding the bar through the hanger the plum line shows you the CG when you get it hanging in the flight attitude. Start with the plane on a table or the groung and the hanger through a pulley in the cealing. then carefully lift the plane while adjusting to bar till a correct flight attitude is achieved,
Now you can move stuff around inside until you get it to balance where you want. Safe, easy, cheep.

Bill