I have two Fender Vintage basses - one a '61-style Jazz, the other a '62 Precision - both with rosewood fingerboards, of course. Over the years, both have developed noticeable bows in their necks. I have taken the necks off each and tightened the trussrods until they bottomed out. On the Jazz, I added a couple of washers, which helped temporarily. They have had homes in disparate climates, but I don't think that's unusual for Fender instruments. Is there anything I can do on my own to reduce the bows or, if not, someone to whom I could send the necks to be repaired at less cost than buying new necks. I live out in the boondocks, so I don't have a local luthier.