The RAF bone dome uses a dynamic microphone wheras the standard GA microphone is based upon the use of a carbon mic which has a DC feed. The output from a moving coil dynamic mic is considerably less than the carbon type and therefore requires amplification as well as a blocking capacitor to prevent the bone dome mic from shorting out the microphone line. A straight adapter will not work, it needs to be designed to adapt the two different types of microphone. I have a circuit diagram for an adapter if you have the ability to make one up.