Just tie a 2 or 3 foot strong cord or some 25 to 50lb test fishing line to the tailwheel and then to a wall hook,, piece of furniture,,a friend or wife,,anything that will hold it up. "Don't use your dog."
Tie another 2 or 3 foot line around your spinner and lift the plane level and then inverted. If it's not super off balance then leave it alone.
Forgot which engine setup your using Nathan ?? If it's mounted 90.degrees then your naturally going to have a heavier right wing than a left. But at the same time the weight of that right wing serves to counter-effect the torque of the engine.
If you must add weight to this plane or change the location of componants to get a lateral balance try moving the battery, RX, etc to the opposite side of the fuse. Adding weight to the wing tip is not a good idea for advanced aerobatic plane IMO. Maybe on a trainer or something that has less roll rate and more wood to attach weight to. Thats just vinyl covered foam on that VF wing tip.

(Just my opinion here.)