fine adjustment tool

plural fine adjustment tools

1. humorousA hammer.

   Use your fine adjustment tool to make the corrections. If your local hardware does not know what a fine adjustment tool is, ask for a hammer.

   1994, Robert R. Rosendahl, Router Projects and Jigs, page 2

   2 more examples

   Last, but not least, of your binding adjustment tools is fondly called a “Fine Adjustment Tool,” more commonly known as a hammer. The one you probably have already is fine. It needn't be big, heavy, or in good condition […]

   1980, Richard Glovin, How to be the Casual Ski Mechanic, page 14

   My father always told me that when your initial attempts with a fine-adjustment tool don't work, the next step is to go after a bigger hammer.

   1984, Georgia Bockoven, Little by Little, page 360