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Is there another idiom for using too strong a tool for the job: not "bring a gun to a knife fight" or "use a sledgehammer to crack a nut"? Or turn it around - one about using a simpler, more direct tool? It may be "kill a fly with..." But nothing I end it with sounds like what I a, looking for. Bazooka, maybe.

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Googling "using a * to kill flies" (with a wildcard) yields, in the first two pages of results,

hammer,
bazooka,
shotgun,
sledgehammer,
flamethrower,
bullet,
cannon,
battleship,
machine gun,
howitzer,
tank,

as well as flyswatter. So it's clear that using X to kill flies is an established idiom, but there's no single word that is predominantly used for X. Pick your favorite weapon or tool and insert it.

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"Don't do that. You'd be killing a fly with a cannonball."

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I like the phrase, "Kill two birds with one small thermonuclear device."

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