Hi, I'm writing because my first own bass guitar, after only 6 years of "use", as gone with a bent neck, which has too much relief, without strings on it. Puting strings increases the relief of course... I painfully reach a "almost flat" neck with the trussrod screwed to the maximum. I contacted a 4,9/5 stars luthier of my region and said "there's nothing to do". The bass is a Cort GB34A, not very expensive; but that's the first... so! What should I try next? Thanks!