I had mine fall out of my revolver at the range at the shooting bench....I was on my hands & knees crawling-around getting the knees of my pants browned with wet dirt in order to find it! Those two little screws on the sides for windage adjustments aren't what I'd expect to find on a gun that costs over $400.00!
The next time I play with that thing, I have to sight it in all over again, being careful to tighten-up both sides after an adjustment. As you probably already know, it takes a jeweler's screwdriver to make the adjustment so you don't bugger-up the screws.
If I was buying replacement blades, I'd get a set of replacement screws as well, since it's so easy for them to fall-out while you're fooling with that sight blade! :wink: And I'd bring some toweling to catch anything that fell off of the revolver prior to tightening the newly installed blade, so you could find it if it "went south" :wink:
Dave