One of the sandblasted XM's I've had before rode a little loose in my pocket, and I wanted to adjust the tension in the clip to be more "comfortable". Since it was a blasted finish, I took a long skinny piece of a paper towel and wrapped it around the end with the screw holes before I put it in a pair of vice grips. I was able to bend the clip with my other hand, while holding the vice grips in the other.
Worked pretty well, so there's an option for you. I'd probably do the same on any finish, but hey that's just me!