Monkey wrench

A monkey wrench was a hand tool with adjustable jaws for turning nuts of varying sizes.

In 2267, James T. Kirk described sabotaging a disintegration station on Eminiar VII as "throwing a monkey wrench into the machinery." 

In a vision experienced by B'Elanna Torres in 2376, the Klingon equivalent of a monkey wrench was found lodged in the port nacelle of Torres' shuttlecraft.