Originally, you had to drill out the screw from inside the trigger pack. That was a pain. HBi provided a bit that works much better from the trigger guard. You just run it through the hole in the bottom of the trigger guard that lines up with the screw head. It goes right through the hex end of the screw, and basically drills out the screw body. Sounds scary, but it's just the right size for a clean job. A new screw comes with the bit too. I ended up with a 3rd Scorpion (2nd pistol), so I may take photos when I do the next one. But JWangster should comment on his experience too. I find it's helpful to hear from total novices to old pros.