About two years ago, I removed the standard sights on my Stainless Ultra Carry with a brass punch and a brass hammer, and replaced them with TruGlo TFOs. No problems whatsoever.
I've been trying to get a set of Trijicons off of another 1911 slide for about a year. They are adjusted too far right and I couldn't move them either way. I was afraid of damaging them, so I did some searching on a couple of forums. The method I found and used was:
1. Make sure you are going in the right direction (remove left-to-right, install right-to-left).
2. Remove set screw, drip in some Kroil or another "creeping oil" into the hole, some on each side of the base, and some at the top of each dovetail. Let stand for a while.
4. Reinsert the screw and tighten it--this moves the sight upward slightly. Drip some more oil and let sit a bit longer (I let it sit overnight).
5. Use brass 1/4" punch with a piece of card stock between the punch and the sight.
Before I re-installed, I got a flat plate, put a sheet of 320 sandpaper on it, put the sight base-down on the sandpaper, and did ten strokes. Rotated it 90 degrees and did 10 more, rotate, repeat, rotate, repeat. Test-fit. Repeat as many times as necessary. Took a while, but I got there.