I just bought a new F512 and I took off the truss rod plate on the headstock to adjust the relief and the channel for the truss rod was packed with something that looked like powdered graphite completely surrounding the nut and on top of that was some sort of dark blue rubbery-like substance. It completely covered the nut so that I could not make any adjustment to the truss rod. On top of that, the instrument came with an allen wrench presumably for truss rod adjustments but it is too short to access the truss rod through the sound hole and isn't even the type of wrench needed for the rod at the headstock. What's going on here? I love this guitar but it looks like some shoddy work here. Anyone else experience this? I bought the guitar new at a Guitar Center in Nashville.