Hello Butcher, I understand you want to fix it, but as an alternative (I had to do it on my old TM Cougar) I set trigger to "shoot with all". the red top button, shoot with main guns, on my throttle I had one button to shoot with mg's
If you can get an old cougar stick, you can probably replace your trigger with one of those, they have the same function, I know for sure other parts (like the 6-way hat) are the same as Cougar.