fine adjuster

A tool used for percussive maintenance.

This tool is also known as a hammer.

Jack was trying to get his computer working using percussive maintenance and wasn't doing anything. Therefore, Jill handed him a fine adjuster.

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Fine Adjustment Device

A comedic pseudonym used within engineering circles for a hammer. It is normally used in the context of taking a brute force approach once other avenues have been exhausted.

It is often used with the term "percussive tuning"

I was working at this problem for days and then I decided to use the fine adjustment device.