This may not help you with your truss rod problem, but if you are ever checking out a guitar again, be aware that some luthiers deliberately profile the fretboard so as to give a greater gap between the frets and the low E string (and other bass strings). This is because the bass strings tend to vibrate in wider arc than the treble strings (esp nylon strung guitars) and may cause buzzing on a completely flat fretboard.Rabbit wrote: I got a Vintage VRS100 which I really like, but on taking it to the local luthier, they told me that the neck is twisted (the relief is different for the high and low E strings). Tragic because it is an awesome instrument otherwise.
Sighting by eye along the fretboard may give the impression that the neck is twisted. However if you measure the thickness of the fretboard on both sides at the nut, and then again on both side down at the 12th (for eg) you may see how the fretboard has been thinned out by a few mm on the bass side.
About the trussrod... are you sure its broken. These things are generally made of steel rod!!! Although i guess you may have stripped the threads or sumpting. If you want to play around, and if the bow is not too pronounced, you can try removing the frets and replaning the fretboard flat.
But unless is sounds totally shite, leave it as it is!