**I originally posted this in 'Basses' but decided to move it here.** Just the other day I was in a store looking at a particular model bass I am after. I was going to buy it until I inspected the neck pocket(was kind of sloppy) and the neck appeared to have a twist in it. You could see a spot where the fretboard took a turn to one side. Maybe it was just uneven frets, but it looked like a twist to me. What causes this to happen to a neck? I think I've read that having no tension dialed in on the truss rod can do it. Can having *too much* tension do the same thing? I play a low action, so I have a good deal of tension on most of my necks. I've yet to see any of them develop this 'twist' though. Is it a manufacturing defect? Can it happen if the woods aren't aged or treated properly? Finally, what can an owner do to prevent this from happening?