You can write your topic however you want, but you need to answer these questions:
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What do you want to achieve? The seat updated its position with the base weld part is tweened
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What is the issue? In this image the seat position without animating the morph:
and in this image when the morph is animating, the seat position is in the same position:
here is the weld between the base and seat:
and the morph is rigged with bones: