Fitted the headset sockets into the seat back - hopefully better than having cables over your knees all the time.
First problem - mic sockets and headset sockets in same bag with no other labels ...... One is 0.2" and the other 0.25". None of the diagrams or schematics says which is which. Called Don T who called Qantas engineers at Perth Airport to determine that the smaller socket (0.2") is the mic and larger socket is the headset. Then could start work!
Cutting through the lining on the seat back took great care - otherwise it twists with the drill bit and pulls off. Soldered the leads and used heat-shrink to wire up the sockets. Fitted the sockets.