Correct

钻头觅缝

/ zuàntóu mì féng /

Strokes

Example

Definition

worm oneself into every crack and crevice—try all possible means

Related

觅裂缝缝合缝踏破铁鞋无觅处，得来全不费工夫苍蝇不叮无缝的蛋找个地缝钻进去塞牙缝从门缝里看人从牙缝里挤出来