Well can't help with the disassembly, but my vent was the same as yours. I didn't take mine apart to fix. You will need to completely pop off the verticle bar that attaches to the back of the flaps. Then align the flaps and place the bar over the attachment points. You then snap the bar in place. It is a bit fiddly but doable. I did mine in a parking lot while the wife was running an errand. Good Luck and lots of patience.
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