Thanks Len and erh! I balanced it using the pendulum method, using a chain with hooks I hung the plane from former F-9 and added weight until the nose was about 15 degrees down. So it is ahead of the plan CG, but inverted it needs no down trim to speak of. I had to add 1 lb of lead, so the AUW came out ot 24lbs, but it sure flies like a lighter plane.