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2015 Ford F-150 passenger seat counterweight

Anyone ever heard of the front passenger seat counterweight breaking loose/vibrating badly?

Is that part of the seat belt ass’y?

New to me.

Just doing a quick Google search shows that this is a common problem. Ford calls it a damper. It’s a weight suspended just under the headrest on 4 rubber bands that break. I guess it’s supposed to keep the seat back from vibrating or jiggling or shaking or whatever. The seat back cover needs to be removed to access the damper.

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Googling suggests the purpose of the counter-weight (at least on some cars) is to lock the seat back in the upright position and prevent it from hinging forward in the event of a collision.