El trémolo es un efecto de la guitarra que proporciona la sensación de que una nota se mantiene...En la guitarra flamenca el trémolo es un recurso muy habitual, pero se diferencia del clásico en que añade una nota más en la cuerda del trémolo, que se toca con el dedo índice. Así se obtiene un sonido más continuado.

What Sandra has said is absolutely correct about playing the technique of 'tremolo' with the fingers; this holds good for both classical and flamenco styles (with the extra note for "flamenco tremolo". But here I think the non-lock tremolo refers specifically to electrically amplified guitars (the clue: candy-red apple colour...) which have a bar for bending the sound of a note or notes.

As for the non-lock part I THINK it refers to one which can be taken off the guitar when not needed, as opposed to one which is built-in...again maybe you should check a few guitar websites such as D'addario or Ibañez to see if they have any references to this....

Good luck!!

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Note added at 43 mins (2007-11-10 22:15:17 GMT)
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www.freepatentsonline.com/5088375.html

This site may be of some help to you, but it's a bit technical!! SUERTE!!

A los trémolos, les decimos "palancas" en Argentina.
Tenés palanca flotante, que gracias a una morsa que se coloca en la cejuela, nos asegura la afinacion de la guitarra aun despues de "palanquearla".

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Note added at 36 days (2007-12-17 04:58:10 GMT)
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http://ivanguitars.4t.com/photo.html

Esa e mi conclusiòn despues de leer www.freepatentsonline.com
deseo te pueda ayudar.