鑿 - chisel

flat chisel

lucubration; elaboration; chisel and ax

chisel

probing (into); digging (into); prying (into); scrutiny; poking one's nose into; poking around

chisel for making dovetail joints

round peg in a square hole

one should do more than what is literally being asked for; when told (to bring) the chisel, (also bring) the mallet