ARRGH, I'm sorry Troy, I was reading and feeding the baby at the same time.

If you really want an accurate balance all the way around, add a screw eye to the model at the lateral/longitudinal balance point and then suspend the plane from the ceiling.

I use modeling clay to make a trial lateral balance because I can fair it into the wing tip. Once I determine the weight necessary and have test flown the model, I mix up a gob of bird shot and epoxy to doctor up the light wing.

While the prop and vertical stab method seems obvious enough, if the plane is set up with any amount of right thrust, the prop shaft will be off of the centerline of the model and consequently, the plane will falsely appear to have a heavy left wing tip.