Slide won’t stay in place

Read the reviews, thought I’d do my sight install properly and get this product. It’s built well and strong...no complaints there, but it doesn’t matter how tight I clamp the slide down when I move the sight pusher it just lifts up on the slide. It lifted the sights into the top bar and marred up my brand new sights. I’m not too happy about this. Waste of my money. :(

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