BSM1
What? Me worry?
Well that puts a spanner in the works.
(Note: This is a test of transatlantic differences.)
Actually when I was in the US Navy about a hundred years ago we had a 'spanner' tool to loosen and tighten the nozzles on our fire fighting equipment. This tool was markedly different from what we call a 'wrench' in that it simply opened and closed to a specific size.