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Truss Rod question!

Ok, so I'm trying to figure out how to adjust my neck. Seems like it has a some up-bow. The strings are much closer to the frets at the lower notes than in the higher notes. I get a lot of string flappage on my lowest string (which is tuned a whole step down. Along with my other strings as well.) I'm pretty bad at eye ballin' my neck, so I need all the help I can get! Maybe it's just an action thing? It just doesn't seem uniform all along the fretboard! Maybe that's just the way it is? Haha! Thanks!
 
To check if the neck is straight i take a good straightedge (my dad works in a machine shop so they're easy to come by) and put it against the fretboard between strings then shine a flashlight on one side and if any light escapes underneath, you need to adjust the truss rod accordingly.

But i do this on a fretless neck so im not sur how well it would work on a fretted.
 
To check if the neck is straight i take a good straightedge (my dad works in a machine shop so they're easy to come by) and put it against the fretboard between strings then shine a flashlight on one side and if any light escapes underneath, you need to adjust the truss rod accordingly.

But i do this on a fretless neck so im not sur how well it would work on a fretted.

This actually works well provided you have a quality straightedge and not your mother's wooden yardstick. One may have to settle for measuring 1st fret to last fret depending on the length but compensated by adding .001" - .002". Once aligned, I would still use a feeler gauge to judge the relief gap between the straightedge and fret at the 8th & 9th. I've seen a couple of guys who use fluorescent fixtures mounted horizontally on the rear of their work benches to better illuminate the details.

Riis