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I recently had mine apart, there are metal pieces that hold the duct baffles, they also control the left and right movement.
These can be rusty or bent which in turn affects the movement of the baffles. I de-rusted mine and lubricated the baffles and not they operate smoothly.
I refurbished my box using a spare broken box, used a Dremel to cut pieces and patched using JB Weld. I had a lot of spare parts because the two that I received through the mail ultimately got damaged going from the US to Canada.
I also used the DMT kit.