Hi 38.
I'm surprised Colt didn't bark at this. Or maybe Beretta bought some design rights.
For those of you still trying to deal with "The Screw": Go out and buy the very best -HARD- screwdriver you can find, one with a good sized handle. I started with one that had a blade width wider than the screw head, but its thickness was right for the slot. I ground just a bit, cooled, then ground again until I had eventually attained the proper width. The idea here is to not destroy the blade's temper with too much heat. Then I profiled the end to match the curvature at the bottom of the screw's slot. This slot is apparently cut with a keyway mill - it is NOT flat bottomed like a normal screw. Secure the pistol frame in a padded vise, but do not squash it, then go to work. Mine came out with a great deal of torque, but it was not damaged in any way. Mine had either red loctite or momma's industrial strength pasta sauce on it. When you reassemble it, a very small amount of blue loctite will suffice.
Hope that helps those of you dealing with The Screw.