Magno Blade
Invid,
To resolve your problem -
Remove trigger from frame.
Remove the grub screw which screws vertically up through the trigger, counting the number of turns.
Apply blue Loctite (243) to the thread of this screw.
Screw the grub screw back into the trigger by the aforementioned number of turns.
IMPORTANT: Turn the gun upside down to ensure that the microswitch lever lies flat.
Refit trigger to frame.
Make fine adjustments to grub screw as required.
Leave Loctite to set (1 hour).
Alternatively....
Get someone else to do it.