Je me renseignerais tout de même... (sinon +1 pour le transparent si on veut préserver l'aspect esthétique de l'original)...
Par exemple :
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Et bien attention : ce genre de pickguard est incompatible avec des tables à vernis nitrocellulosique dont notamment certaines Martin (comme la cs21-11) ! risque d'endommager sérieusememnt le vernis ! Le saviez vous ?
http://www.les-grandes-guitare(...)tatic
Ou encore :
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As a solvent based plastic, celluloid tends to shrink over the years, making the pickguard curl around the edges.
It puts extra stress on the wood beneath the pickguard and sometimes cracks appear. This is very common on older Martin acoustic guitars. On electric guitars, where the pickguard is attached with screws, vintage celluloid pickguards tend to develop cracks due to stress caused by shrinking.
http://en.wikipedia.org/wiki/Pickguard
Un article complet ici (si tu lis l'anglais) :
http://www.fretnotguitarrepair(...)d.php
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Pickguards glued directly to the bare wood can cause top damage when they shrink
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Clear Pickguards
For those who don't prefer pickguards but are afraid of damaging the finish you may opt to install a clear pickguard. Clear pickguard material is much thinner than regular celluloid pickguard material and applies much like a sticker. While this can sound ridiculously easy, more experience is needed to apply these correctly than a traditional guard.