Nearly every experienced guitar tech I've talked to confirms what Joshua said. Adjust the truss rod under normal string tension. You're not going to see the results immediately...the neck can take up to 48 hours to settle in to its final position. Then you can decide if further adjustment is needed. Sometimes a truss rod adjustment can take up to several days to complete, depending on how much tweaking is necessary.EagleMoon wrote: Don't loosen the strings when you adjust the neck? I've always done that. I was always told to loosen the strings so that the neck didn't have to work so hard to straighten out.
EagleMoon wrote:So how would you know if you had to adjust one of the truss rods and not the other?
As a general rule, you'll want to adjust both rods equally...i.e. up to a quarter turn at a time (max) on both rods. Wait at least a day and then repeat the process if needed. The only time you'll want to adjust "asymmetrically" is if the neck exhibits any twisting. Sight down the fingerboard and if you notice the line of frets starts veering off to one side or the other, you've got a twist. You can remedy this by tightening or loosening on one side or the other. That's the beauty of the dual rod system. With a single truss rod, a neck twist usually means a trip to the local luthier.
