Your new arm looks great but i hope you are thinking about the mechanical advantage you are losing from the extra length in the arm. The airplane you are seeing with the original arms on it is from New Mexico. That gentleman has been using them for years and i belive you are headed in the right direction with the Circuit board material. The other thing you should notice is the servos he is using have an out put torque i belive in the 130 in/oz range at 6 volts and he has offset his horns aft of the hinge center line to gain the mechanical advantage back from the extra long arms....just a note for you to think of.