Related:

• Keep your ear to the grindstone, your nose to the ground, take the bull by the horns of a dilemma, and stop mixing your metaphors.
  -- Grammar rules for the unenlightened...
• Put your nose to the grindstone and you're a bloody fool.
• Keep you Eye on the Ball, Your Shoulder to the Wheel, Your Nose to the Grindstone, Your Feet on the Ground, Your Head on your Shoulders.
  Now...try to get something DONE!...
• Keep your Eye on the Ball, Your Shoulder to the Wheel, Your Nose to the Grindstone, Your Feet on the Ground, Your Head on your Shoulders.
  Now... try to get something DONE!...
• Put your Nose to the Grindstone! -- Amalgamated Plastic Surgeons and Toolmakers, Ltd.