Sometimes we have to push our friends further than we want. Here it is pushing off the original rear sight from the old warhorse. Worked like a charm.
Because they cut some corners on this universal pusher to keep costs down, some key items were changed. Most critical was the substitution with fine-pitch acme threads on the actual pusher with a common hardware store 1/4x20 bolt. I estimate the thread is about five times finer on the specialized Glock pusher. This means that while one turn moves the sight only a fifth as far, you can also apply five times the force with the same effort on the handle.
Pushing the new sight on, some dimension of the dovetail on the sight went a little off about halfway through the job. I could not turn the handle with all my strength, so I used the time-honored dodge of putting a cheater bar on it.
It took a lot of effort, but I was able to turn the handle several more times. Yet the sight hadn't budged. Where did all that effort go? I stepped back and looked at my setup.
The rear sight was still so tight, I had started to push all the mechanical slack out of the pusher, instead. If you look closely, you can see that the slide is now tipped to the right. I had enough leverage to do something, and that something was to jam the pusher until there was no more room for the adjustment block to tilt to the right any more.
While things were now warped out of line, they still lined up with each other, so I took the risk, and applied still more force to the lever. Finally there was no more room for anything else to move, so the sight finished its journey to the right, stopping in the center like it should. The pressures on everything was so great, I had to tap the handle with a hammer to break things loose so I could take the slide out. I saw that the pusher had even pressed a small dent into the solid steel of the sight.
This was almost a "Mission Impossible", but the pusher came back to square when the slide was removed. I hope things work better with the Trijicons I have coming in, but I remember that, even with the proper Glock pusher, one rear sight went on easily, and the other was almost as bad as this one, requiring my cheater bar again. And that was for a $100 set of sights, not a $12 cheapie like this one.