I made 2 stands - one with a 'V' at the top that the prop bolt goes into and one with an outside curve that goes under the tail and shim up one stand to level the plane, then I use finishing nails to balance the liter wing.

You can balance the wing separately but I don't really see a need for it. I balance it with everything on the plane that it's going to fly with except fuel. Just drive the finishing nail into the wing tip, hit with CA and put a small covering patch over the hole/s.

If I need allot of weight ( heaven forbid ) and the lite wingtip is solid balsa I hollow out a spot in the wingtip and fill it with OO Buck shot & epoxy until it balances and cover with a patch.