Have seen others use spaghetti brushed with lustre dust.....two, if necessary. Or they use gumpaste pushed thru a small-diameter hole disk, dried, etc.....
gumpaste cracked when I did mine. tried 50/50 with fondant and it was very hard to push thru the extruder and they cracked during transport. I switched to straight fondant because easier to push thru and they didn't crack. Hope this help.
I did just fondant. It lays down on the frets, and isn't completely straight, but other than that... Duff uses real guitar strings...
. . . another thread may help . . .
http://cakecentral.com/cake-decorating-ftopict-609814-guitar.html+string
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