Truss rod nuts are located at either the peghead or the end of the neck. Site Map | Privacy, Use the appropriate sized wrench/socket (if in doubt check the manufacturer's website), Start by loosening the rod a little first*. Notice the curved wrench to the left below ...this passes under the top brace and back up to the truss rod nut. .004"- .006" is probably best for light pickers, jazz musicians and instruments strung with medium gauge strings. Numerous instruments have come to me with striped truss rod nuts, this is avoidable in most situations. These often require specially shaped wrenches which will snake around the top brace and back up to the heel of the neck. Measure the gap between the bottom of the string and the top of the 7th fret. Common problems associated with, but not exclusive to, neck relief are: Ideally we are adjusting the truss rod to render the neck as flat as possible without creating too much string buzz. Truss rods often require adjusting after changing string gauges or when temperature and humidity change the amount of bow in the neck. [2] X Research source You don't have to take off the strings to adjust your truss rod. The number one reason people won't touch the truss rod is that they are afraid of making a mistake and damaging it. Truss rod nuts located at the heel end of the neck are often accessible thru a hole just beneath fingerboard extension and thru the top brace. On some instruments this may result in a noticeable change in relief, in others it may not. A few instruments have truss rod nuts at the heel that are not readily visible. The measurements above serve as simple guidelines and starting points to those still learning about neck relief. Copyright © Fret Not Guitar Repair Inc. Not all truss rod nuts are replaceable, some are welded to the rod. The truss rod is actually compressing the neck exerting pressure against the backside of the neck which causes it to bend backwards. If a neck has too much relief (upward bow) tightening the truss rod will straighten the neck. Nuts located at the peghead are often concealed behind a small truss rod cover and are easily accessible. *If a truss rod is already as tight as it can go, starting an adjustment by tightening the nut first could end in a horrifying pop. That is why truss rod adjustments are normally done in conjunction with a set up. One end is threaded for an adjusting nut and is accessible at either the peghead or through the soundhole. Truss rods often require adjusting after changing string gauges or when temperature and humidity change the amount of bow in the neck. How? Different gauges of strings may call for additional adjustment. Adjusting the truss rod with the instrument tuned to pitch will allow us to gauge our progress and continue re-checking relief before making further adjustments. How else would we understand what "just a little" or "way too much" actually equals? It's a healthy fear actually but once you understand how it functions and get some practice you should be able to make these adjustments yourself. Truss rod adjustments are made to alter the straightness (flatness) of the neck. Truss rod adjustments are made to alter the straightness (flatness) of the neck. String gauge, playing style, neck and top stiffness can vary from one guitar to the next and as a result, so can ideal neck relief. The largest gap is usually towards the center of the neck. The access for adjusting the truss rod on an acoustic guitar is normally found either: At the soundhole; or Under a cover at the headstock end (usually you can get in there via a few screws) Starting with a dead flat neck I increase neck relief slightly until the instrument plays without buzzing. Taylor & similar small nuts 1/4" socket. The other end is anchored to give the adjusting end something to tighten against. The distance between the top of lets say the 7th fret and the bottom of our straightedge can be measured with a feeler gauge to give us an exact measurement. Relief is actually created by string tension, once a truss rod has been completely loosened the strings not pull relief into the neck with less resistance. A mirror must be placed inside to see the access point. Common Truss Rod Nut Sizes (You can play during the adjustment time.) This is why the instrument should be tuned to pitch before adjusting the truss rod in most cases.

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