RE: Yellow Aircraft P-40 Engine?
Chris,
The lead in the copper tubing works really well. Be sure to do this before you glue the hinge points in for the rudder. I cut a generous section out of the rudder post, between the hinge points to access the vertical stab. After we balanced the airplane, I cut off a bit of lead to cover the cloth, resin and foamofil used to hold the ballast in place. After we buttoned up the tail, we rebalanced the bird, using a slight bit of weight in the tail wheel area. It really worked out sweet and will NEVER break loose.
Good luck.
Regards
Craig