I didn't realize that nipple in the carb body wasn't effective if the case isn't drilled. The case is not drilled. Guess I may want to get rid of that line. Hehehe. Is the prop back plate unique because it's hex shaped? I have a few of them. As to the balance the manual said 1/2-1" from the leading edge. I set it at 3/4". That's on a wing with a minimum 5" chord and a bit of taper in the rear. That's puts the CG about 20% at 1". The bellcrank center is factory positioned. The lead out guide it set with the rear line (down control) paralell to the leading edge as per the instructions. Does that sound about right?