tweaker

/ ˈtwiːkə /

noun

1. slang.
   an engineer's small screwdriver, used for fine adjustments

Example Sentences

I did wonder,' he said, 'whether you were such an innocent as really to believe it was a tweaker.'

From Project Gutenberg

McTurk read the papers of those years and could be trusted for general information, which he used as he used his "tweaker."

From Project Gutenberg