How can I easily UNcouple this slide and lock, on office chair?

While my hunky husband was lifting the chair up, and my brawny brother pushing the frame down, I kept hitting the top of the slide with a screwdriver, to try to loosen the slide. But these parts are still wedged too tightly! We ran out of energy and ideas! How can we life hack this please?

Can someone please make my GIF appear in line? https://imgur.com/Hu6rV57

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How can I easily UNcouple this slide and lock, on office chair? [closed]

Can someone please make my GIF appear in line? https://imgur.com/Hu6rV57

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