“I recently got brave and bought a tool to adjust the truss rod on my Martins. Not sure I know what I’m doing. Have you published any information that might help me out?”
I haven’t specifically written a post on truss rod adjustment, which is ironic because it’s one of the top questions I get about guitar DIY. The reason I’ve avoided it is because it’s a tough topic to tackle in writing. Every guitar is just a little different in how it responds to tweaks, so there’s always a bit of “feel” and experience that comes into play.

When it comes to turning the truss rod bolt, just follow the old adage: righty-tighty (clockwise) and lefty-loosey (counter clockwise). That’s if you’re oriented so that you’re facing the truss rod bolt itself. Here’s what I mean:
Acoustic Guitar Setup
If your truss rod is inside the soundhole (like most acoustics), you’d be standing at the body-end of the guitar (where the strap button is) staring straight down the guitar toward the headstock. That’s where it’s righty-tighty and lefty-loosey. I’ve shown this in the photo below.
On the other hand, if you’re doing this with the guitar in the playing position, you’ll push your truss rod wrench’s handle down toward your lap to tighten, or pull it up towards your face to loosen.
Tightening the truss rod will apply back-pressure to the neck, essentially bending it backwards and counteracting the the pull of the strings.
Diy Adjusting String Action On Acoustic Guitar
You’ll usually tighten your truss rod if your action (string height) is feeling a little higher than you’d like. Your guitar’s neck may have developed just a bit too much forward-bow (relief), which can be the normal result of humidity and seasonal weather changes.
Lowering the action on your guitar requires more than just a truss rod tweak. To make a big change in your acoustic guitar’s string height, you’ll need a full setup, which involves adjusting the truss rod, sanding the bridge saddle, and sometimes deepening the string slots of the nut.

If you tighten the truss rod too much in an effort to get your strings as low as possible, you’ll create a back-bow, which will cause excessive fret buzz or notes that fully fret-out (don’t make any sound at all). You never want backbow in a guitar neck.
Two Ways To Turn The Truss Rod On An Acoustic Guitar
As a side note: most guitar manufacturers send out their guitars with the action purposely on the high side, so that the future owner can lower it to their personal taste. So, if you’ve ever ordered a high-end guitar and been surprised at how high the strings are, this is why. It’s rarely due to poor setup at the factory.
Loosening the truss rod will relive back-pressure on the neck, essentially allowing the neck to bend forward. You’ll do this if your strings feel too low, which is usually accompanied by annoying fret buzz or notes that completely fret-out (are completely muted).

You’ll usually loosen the truss rod if your strings feel too low… which is often accompanied by excessive string buzz or notes that completely fret-out.
How To Adjust Your Guitar Truss Rod?
This can happen with excessive humidity, which causes the fretboard wood to swell enough that it actually bows the neck backwards slightly (or makes it flatter than it should be).
It can take a day or two for the neck to fully “settle” into an adjustment. You’ll certainly see some neck movement immediately after making a truss rod adjustment, but wait overnight to see the full effect, as the wood continues to slowly bend into its final position.

Many inexperienced guitar DIY-ers aren’t aware of this and think they’ve got their truss rod dialed-in… only to discover the next day that their action has mysteriously become too high or too low.
How To Adjust The Truss Rod Of A 2011 Epiphone Les Paul Special Ii
You can really end up chasing your tail this way, so be patient and give the neck enough time to settle. You can still play your guitar during this time.
As a side note: most guitar manufacturers send out their guitars with the action purposely on the high side, so that the future owner can lower it to their personal taste. So, if you’ve ever ordered a high-end guitar and been surprised at how high the strings are, this is why. It’s rarely due to poor setup at the factory.
Loosening the truss rod will relive back-pressure on the neck, essentially allowing the neck to bend forward. You’ll do this if your strings feel too low, which is usually accompanied by annoying fret buzz or notes that completely fret-out (are completely muted).

You’ll usually loosen the truss rod if your strings feel too low… which is often accompanied by excessive string buzz or notes that completely fret-out.
How To Adjust Your Guitar Truss Rod?
This can happen with excessive humidity, which causes the fretboard wood to swell enough that it actually bows the neck backwards slightly (or makes it flatter than it should be).
It can take a day or two for the neck to fully “settle” into an adjustment. You’ll certainly see some neck movement immediately after making a truss rod adjustment, but wait overnight to see the full effect, as the wood continues to slowly bend into its final position.

Many inexperienced guitar DIY-ers aren’t aware of this and think they’ve got their truss rod dialed-in… only to discover the next day that their action has mysteriously become too high or too low.
How To Adjust The Truss Rod Of A 2011 Epiphone Les Paul Special Ii
You can really end up chasing your tail this way, so be patient and give the neck enough time to settle. You can still play your guitar during this time.
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