Plausible way to make a planet spin faster

Imagine that you want to colonize Venus. But a day on Venus lasts 4 months, and that's terrible. The big brains at the Science Palace have decided to make Venus spin faster, so that the length of day would be correct (one of the big brains suggested putting opaque shields into orbit that would artificially create night-time, but he got demoted).

What is the lowest tech level at which this idea is plausible, and what would it look like? Would there be any fun side effects of the method/its results?

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Plausible way to make a planet spin faster

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