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Is there a word for (the metaphorical meaning of) "Stellschraube" in English?

The German word "Stellschraube" means, in its technical sense (according to

  • setscrew
  • binding screw
  • regulating screw
  • set screw
  • setting screw
  • adjusting screw

However, in a metaphorical sense, it can also mean a "leverage point" to adjust something non-technical. For example, motivation might be a "Stellschraube" for teachers to create a fruitful learning atmosphere.

Is there an English word having a similar meaning?