釘くぎ師し

noun

pachinko nail adjuster

Colloquial term for a pachinko parlor employee who adjusts the machines' nails to control payout rates and profitability.

• 彼かれは長なが年ねんパチンコ店てんで釘くぎ師しとして働はたらいている。

  He has worked for many years as a nail adjuster at a pachinko parlor.