On the nail

Al instante, inmediatamente. Nosotros diríamos "al toque". A tourist came and asked to have his car shipped to Montevideo on the nail: Vino un turista y pidió que el embarcaran su auto a Montevideo al instante.

Dictionary.com nos dice que es una expresión informal pero agrega otro significado aparte del anterior:

a. of present interest; under discussion
b. without delay; on the spot; at once: He was offered a job on the nail.

El diccionario Cambridge de idioms nos trae lo mismo:

If you pay an amount of money on the nail, you pay all of it immediately. "He always paid cash, on the nail."

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