Use a sledgehammer to crack a nut; Throw a spanner in the works; Bodies upon the gears; Maslow's hammer; Between the hammer and the anvil; Between a rock and a hard place; Drop the hammer on; Go under the hammer; Dumb as a bag of hammers; Dumb as a box of rocks; Not the sharpest tool in the shed; Sledgehammer argument; Poor craftsman that blames his tools; Tools of the trade; Tool around