Whichever direction is turned to compensate for the back bow has been done completely. I believe it is loosening to relieve the neck as opposed to tightening to bring down an upward bow. Anyway these guys at Gryphon Strings in Palo Alto are an authorized Martin service center and work on a lot of them. He said it is something about Micarta not adjusting itself to the change that obviously happened in the neck wood for whatever reason. Martin has since started using 2-way truss rods so that forward bow can be put into the neck by turning the truss rod backwards.
__________________
Martin 000-17S Prototype (Ebony Freboard/Bridge)
Martin 0000-18 Custom (Gruhn 2006)
Martin JC-16GTE 2001
Gibson CS Les Paul Special Single Cut Faded Cherry VOS
David
|