Saying for using an overly powerful tool to fix a minor problem

I found "A sledgehammer to crack a nut" as one example. What are some others?

Consider,

a [sledge]hammer/cannon/shotgun to kill a fly

Ngram

a nuke to kill a fly

Mathematics StackExchange

a [cruise/nuclear/heat-seeking] missile to kill (or zap) a fly

Google Books

Consider "to break a butterfly on a wheel":

Who breaks a butterfly upon a wheel?

A rhetorical question referring to an excessive amount of force that has been applied to achieve something minor, unimportant, or insignificant.

To "break upon a wheel" refers to a mode of torture, in which a victim has his or her bones broken while strapped to a large wheel.

(The Free Dictionary)

If a single word is OK, try overkill:

An excess of what is necessary or appropriate for a particular end

(AHD)

Also, you can use a sledgehammer to swat a fly, too.