I like setting up my guitar and bass necks vary flat. One thing I noticed is I can get the necks pretty close to flat, but at some point the truss rod just will not turn any further. Even thought all manufactures indicate you can get a back bow by tightening, I've never experienced it no matter how tight I adjust the truss rod. Not that I'd want backbow, I just don't think one can get it on some necks, at least the ones on my guitars and basses. My thought is at some point the truss rod is as much trying to compress the neck as it is trying to bend it back, so at that time it's just not going any further with tightening. Also, I can see a one piece neck or a neck with a veneer fretboard bending back, but a glued on slab fretboard (be it rosewood, ebony, or maple) with its grain going in a different direction would resists a backbow as the fretboard would need to be stretched as the neck bends back. Anyone else have this same experience? Again, I'm not trying to get backbow, I'm must curious if I'm the only one that has experienced this.