Four channels so two servos needed
I still do have my Metz (Germany) two channel servo of the past so a second was needed to complete the 4 channel, two servo radio.
My choise was the Simprop Contest (analog) proportional servo converted for 2 tone filters. (Back io the future!). The limit- and neutralizing switches are mounted on the place of the potentiometer. Speed is reduced by a resistor.
Some details to make the servo reliable, wiring etc, but he will do the job.
Neutralizing is done by energizing the (second) tonefilters, Profit, only four wires are needed to couple the servo with the receiver. No tab is needed, the motor is energized by 4,8 VDC.
Video:
http://www.youtube.com/watch?v=bPTAV...ature=youtu.be
TF