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So we keep on fixing it. Big ol' railguns firing mass out into space. (If we run out, borrow some from the moon.)

If we run out, we have problems much worse than varying day length.

It would be easier to carefully collide asteroids at an oblique angle.

Wouldn't that make a mess though?

Put the impact zone in your favorite geopolitical enemy's backyard. Kills two birds with one, err, stone.