Hi all. I have a question..has anyone heard of a way that a super strong but super thin material ( ebony) that can be used as both a shim under the fretboard to straighten out an old non truss rod neck as well as it raising the action a bit. Any help would be greatly appreciated.
Danny , I think you need to describe the problem better , rather than your cure . Photos?
Shimming the fretboard on a National is a non-starter IMO.
Read through this article, http://www.strangeguitarworks.com/national-resonator-neck-reset/ , it will give you an idea of the way to go about solving your problem, which I suspect is identical to the one in the article.
hi Murray, thanks for the info..the article is great