Ok, got things sorted on this one, got the 3rd channel working and ended up cutting down the shaft carefully.

But now im having problems with my brand new replacement MMM i just put in yesterday. It is working fine with just the esc plugged into the reciever but when the steering servo or brake servo is plugged in it just seems to have a fit and nothing will work as the reciever lights flash on and off and the servo's twitch.

I have tryed differant servo's differant reciever's and checked all conections on the esc but nothing seems to change it.
I removed the red power wire from the plug and put a external bec on the esc and found everthing works fine this way even with both brake and steering servo's in.

So im guesing the internal bec has a problem and yet again will have to send it back to castle and this will be the 4th time this year i have had to send a MMM back to castle this year from australia and its getting frustraiting.