I tried to do a search on this and didn't come up with anything that helped me. I have a model 19 that has Trijocon night sights on that I think are factory and have never had any issues drifting sights to where I wanted them to be with a brass punch and a hammer, but, this one doesn't want to go where I want it to go. It overshoots where I want it to be. A buddy of mine picked up a "Glock" brand sight adjusting tool (stamped for 17, 19 right on it)that he is letting me borrow and when I asked him how to use it he said he didn't have a clue, but, I SHOULD be able to figure it out. Apparently, I'm not as smart as he's giving me credit for. I screwed around with it for a while and decided to put up a post here to see if somebody can help my old, feeble mind. The tool has a knurled wheel that allows you to move a plate that rides on two roll pins. It looked to me like that plate SHOULD go in to the back of the slide cuts, where it rides on the frame rails, but, it won't quite go in and I don't want to force it. Any help would really be apprecitated!!!