It's a simple ghetto mod - you simply put an elastic band around the leaf spring and the board. One that's not too small to pull the leaf in - but just small enough to have the 'hole' in the leaf sit very close to the sensor.
Shortens your trigger pull right down - without messing with allen keys or grub screws etc.
It's one of the few mods that actually does work
.
If I get time - and can be bothered - I'll photo mine and post it up.