Ok I'll definately give that a try. I'm planning on doing the transmitter mod too like yours but wanted to sort this problem out first. If I have no joy would I be able to trigger the recoil off of the ARM module by connecting to one of the motor wires? That way I wouldn't have to mod the transmitter and all will be off the k button. The disabled track recoil would then trigger the cannon recoil as I think the signal still goes into the ARM module. Correct me if I am wrong. Cheers