Ash is paraphrasing what is usually applied to the wheels of justice.
Quotes:
The Wheels of Justice Grind Exceedingly Slow. But They Grind Exceedingly Fine.Jan 16, 2010
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The Wheels of Justice Grind Exceedingly Slow. But They Grind Exceedingly Fine. Do You Recall "Chemical Ali"? | The New Republic
Ash is paraphrasing what is usually applied to the wheels of justice.