How To Adjust Action: Essential Resonator Guide

Adjusting the action on your round neck resonator guitar involves carefully adjusting the bridge and nut to achieve comfortable string height. This guide provides a straightforward, step-by-step process for beginners to improve playability and sound, making your resonator guitar a joy to play.

Playing a resonator guitar is a unique experience, and sometimes, the strings sit a little too high or too low for your liking. This is called “action,” and it affects how easy it is to fret notes and how the guitar sounds. If your resonator guitar feels a bit stiff on your fingers, or if the strings are buzzing, adjusting the action is a great fix. Don’t worry if you’ve never done it before; it’s simpler than you might think. We’ll walk through it together, step-by-step, so you can get your resonator guitar playing just right for you.

Why Adjust Your Resonator Guitar’s Action?

The “action” of your guitar refers to the height of the strings off the fretboard. When this is just right, playing becomes smooth and effortless. Too high, and your fretting hand will feel strained, making it tough to press the strings down. Too low, and you might get annoying buzzing sounds from the strings hitting the frets.

For round neck resonator guitars, especially those played with a slide and often favored for blues and bluegrass, the action needs to feel comfortable for both fretting and slide playing. Many players find that the factory setting isn’t always perfect for their personal style or playing technique. Adjusting it allows you to:

Improve Playability: Make it easier to form chords and play faster passages.
Reduce Finger Fatigue: Less effort is needed to press down strings.
Eliminate Buzzing: Get a cleaner, clearer tone without unwanted noise.
Enhance Tone: Proper action can sometimes contribute to a better overall sound projection.
Optimize for Slide Playing: Many resonator players prefer a slightly higher action for clear slide articulation once they find their sweet spot.

This guide will focus on how to adjust the action for a round neck resonator guitar. We’ll cover the most common and effective methods.

Understanding Key Components Affecting Action

Before we start adjusting, let’s get familiar with the parts of your resonator guitar that directly impact string height.

The Bridge

The bridge on a resonator guitar is crucial. For round neck models, it typically consists of the saddle (where the strings rest) and the biscuit (a small piece of wood, usually maple or ebony, underneath the saddle). The height of the saddle is the primary determinant of your string action.

Saddle: This is the part the strings actually sit on. It’s usually a thin strip of bone, plastic, or composite material.
Biscuit: This small piece of wood stabilizes the cone and transfers string vibrations to it. The saddle sits on top of the biscuit.

The Nut

The nut is located at the headstock end of the fretboard. It has slots cut into it to guide the strings. The height of the nut slots also contributes to the overall action, particularly in the first few frets.

Nut Slots: These grooves hold the strings at the headstock. Their depth and spacing are important.

Tools You’ll Need

Having the right tools makes the job much easier and safer for your guitar. You don’t need a professional luthier’s workshop, but a few essential items will help immensely.

Here’s a list of what you should have on hand:

Screwdrivers: A set of precision screwdrivers (Phillips head might be needed for some bridge adjustments) and a flathead screwdriver for truss rod adjustments (if necessary, though we’ll primarily focus on bridge/nut adjustments for action).
Ruler or String Action Gauge: A precise ruler (preferably with millimeter markings) or a specialized string action gauge is essential for measuring string height accurately. You can find these online from guitar part suppliers.
Guitar Picks: Various thicknesses can be helpful for measuring or even temporarily shimming.
Small Files: Nut files are ideal for making precise adjustments to nut slots. If you don’t have these, very fine jeweler’s files can work, but use extreme caution.
Sandpaper: Fine-grit sandpaper (e.g., 220 grit and above) for smoothing any adjustments.
Workbench or Stable Surface: A clean, flat surface to work on.
Soft Cloths: To protect the guitar’s finish.
Optional: Small Shims: Thin pieces of plastic, hardwood, or even dense paper can be used to raise the saddle.

Remember, patience is your most important tool. Take your time with each step.

How to Measure Your Guitar’s Action

Before you adjust anything, you need to know where you’re starting from. Accurate measurements are key to a successful adjustment.

Step 1: Tune Your Guitar

Ensure your resonator guitar is tuned to standard tuning (E-A-D-G-B-E). An out-of-tune guitar won’t give you accurate action readings.

Step 2: Choose Your Measurement Points

We’ll measure action at two main points:

At the 12th Fret: This is the most common place to measure overall string height.
At the Nut: This measures the initial height of the strings.

Step 3: Measure at the 12th Fret

1. Place your ruler or action gauge under a string at the 12th fret.
2. Measure the distance from the top of the fret to the bottom of the string.
3. Repeat this for each string. Some players prefer to measure only the low E and high E strings, while others measure all six. Measuring all gives you a comprehensive picture.

A common starting point for resonator guitar action at the 12th fret is:

Low E string: 2.5mm to 3.0mm
High E string: 2.0mm to 2.5mm
Middle strings: Somewhere in between

This is a general guideline, and personal preference will vary, especially for slide players who might prefer it slightly higher.

Step 4: Measure at the Nut

1. With the guitar tuned, measure the distance from the top of the fret to the bottom of the string in the nut slot.
2. Again, doing this for all strings gives you a full picture.

Ideally, the strings at the nut should sit just right above the first fret. If they are very high, you might need to address the nut slots.

Adjusting Action: The Bridge Method (Most Common)

The bridge is where you’ll make the most significant adjustments to your resonator guitar’s action. Here’s how to do it safely.

Step 1: Loosen the Strings

To avoid damaging your guitar or making measurements difficult, always loosen the strings significantly before attempting any bridge work. This relieves tension on the saddle and bridge. You don’t need to remove them completely, just slacken them to the point where they have no tension.

Step 2: Remove the Strings from the Bridge

Carefully remove the strings from the bridge. This usually involves untying them from the tailpiece or bridge pins if your resonator has them. If your resonator has a traditional “string-through” bridge with pins, you’ll need to remove the pins and pull the strings out.

Step 3: Remove the Saddle and Biscuit (If Necessary)

Many resonator guitars have a saddle that simply rests on top of the biscuit, which in turn rests on the cone.

1. Lift the strings away from where they rest on the saddle.
2. Carefully lift the saddle out of its slot on the biscuit. It’s often just a snug fit.
3. The biscuit itself might need to be removed if you’re attempting a more significant adjustment or if the saddle needs to sit lower. It might have small pegs or simply sit snugly. Be gentle; these are often made of wood and can be delicate.

Step 4: Adjusting Saddle Height

This is where you’ll make the primary action adjustment. There are two main ways to change the saddle height:

Lowering the Saddle:
If the action is too high, you’ll need to shave down the existing saddle or replace it with a thinner one.
Shaving: Mark the desired height on the saddle. You can use fine-grit sandpaper on a flat surface. Gently rub the bottom of the saddle back and forth on the sandpaper, checking your progress frequently. Aim for even sanding.
Replacing: You can purchase thinner saddles from guitar parts suppliers.

Raising the Saddle:
If the action is too low, you can add a shim under the saddle.
Use a thin, dense material like hardwood veneer, dense plastic, or even a few layers of sturdy paper. Cut the shim to match the shape of the biscuit where the saddle sits.
Place the shim on the biscuit, then place the saddle back on top of the shim.

Important: Take small adjustments! It’s much easier to remove more material/add more height than to fix removing too much. Make a small adjustment, reassemble, string up, and check your action.

Step 5: Reassemble and String Up

1. Place the biscuit back in its correct position.
2. Place the adjusted (or replaced) saddle back on top of the biscuit. Ensure it’s seated correctly and is straight.
3. Restring your guitar. Don’t fully tighten the strings yet.
4. Tune the guitar to pitch.

Step 6: Check the Action and Repeat

1. Measure the action again at the 12th fret and at the nut.
2. Compare it to your desired height.
3. If it’s still not quite right, repeat steps 1 through 6. Loosen strings, remove saddle/biscuit, make further adjustments, reassemble, string up, and re-measure. Consistency is key.

Adjusting Action: The Nut Method (For Lower Frets)

If your action feels good at the 12th fret but is too high or buzzes on the first few frets, the nut slots might need attention. This is a more delicate process.

Step 1: Assess the Nut Slots

With the guitar tuned, look at the nut slots. Are the strings sitting very high above the first fret? Does it feel hard to fret notes in these early frets?

Step 2: Understanding Nut Slot Adjustment

Adjusting nut slots involves filing them deeper. This is where using specialized nut files is highly recommended. Trying to use regular files can easily damage the nut and create an unfixable situation.

Professional Help: If you are unsure or do not have the correct tools, it’s best to take your guitar to a qualified guitar technician or luthier. They have the expertise and tools to do this safely. You can find resources for finding a luthier through organizations like the Guitar Tech.

Step 3: Filing Nut Slots (Proceed with Extreme Caution)

1. Loosen Strings: Slacken the strings considerably or remove them.
2. Use Nut Files: Select a nut file that matches the gauge of the string you are working on.
3. File Gently: Place the file in the slot. At a slight angle, make a few gentle, back-and-forth strokes. The goal is to deepen the slot, not widen it significantly.
4. Check Progress: String up, tune, and test the action at the first fret. Repeat filing as needed, checking frequently. The string should sit just above the first fret.

Warning: Filing too deep is irreversible without replacing the nut. Always file away from the headstock towards the fretboard.

When to Seek Professional Help

While many guitar adjustments are beginner-friendly, some tasks are best left to the experts, especially if you’re new to guitar maintenance or have a valuable instrument.

Consider professional help if:

You need to adjust the truss rod. This rod runs through the neck and affects its curvature. Improper adjustment can damage the neck.
The nut slots are severely damaged or you don’t have the correct tools and confidence to adjust them.
Your bridge is glued or permanently fixed, and you’re not sure how to approach adjustments.
You’ve made adjustments, and the guitar still plays poorly or sounds bad.
Your resonator cone itself seems to have issues (e.g., rattling, deformation).
You have a very expensive or vintage instrument and want to minimize any risk of damage.

A good guitar technician can diagnose problems accurately and make precise adjustments. They can also provide advice on maintaining your instrument’s setup over time.

Maintenance Tips for Your Resonator Guitar

Keeping your resonator guitar in good shape ensures it continues to play and sound its best, and proper action is part of that.

Regular Cleaning: Wipe down your guitar after playing with a soft, dry cloth to remove sweat and oils.
Proper Storage: Store your guitar in a case or gig bag when not in use, away from extreme temperatures and humidity.
Change Strings Regularly: Old strings sound dull and can be harder to play. Changing them also gives you an opportunity to inspect the bridge and nut.
Periodic Check-ups: Get your guitar checked by a technician annually, or more often if you play frequently. They can catch potential issues before they become major problems.
Be Gentle with Adjustments: Always make small, incremental changes when adjusting action. Rushing the process can lead to mistakes.

Common Resonator Action Issues & Solutions Table

Here’s a quick reference table to help diagnose and fix common action problems on your round neck resonator guitar.

Problem	Cause(s)	Solution(s)
Strings are too high (hard to fret, painful)	Saddle is too tall.	Lower the saddle by sanding it down or replacing it with a thinner one.
Strings are too low (buzzing on frets)	Saddle is too short.	Add a shim under the saddle, or replace with a taller saddle.
Buzzing and difficulty fretting notes in the first few frets	Nut slots are too shallow.	Carefully file nut slots deeper using appropriate nut files. (Professional help recommended).
Uneven string height across frets	Irregular saddle material, uneven frets, or neck issues.	Check saddle for uniformity. If frets or neck are the issue, professional assessment is needed.
Buzzing only on open strings	Nut slots are too low, or tuning pegs are loose.	If nut slots are the issue, carefully file them deeper (professional help recommended). Tighten tuning pegs.

FAQ Section

Here are some common questions beginners have about adjusting resonator guitar action.

Q1: How high should the action be on a resonator guitar?

There’s no single correct height, as it depends on your playing style. For general playing and fingerstyle, a common range at the 12th fret is about 2.0-3.0mm. Slide players often prefer it a bit higher, around 2.5-3.5mm, to avoid hitting fingers on the frets while sliding.

Q2: Can I adjust the action without loosening the strings?

It’s highly recommended to loosen the strings before adjusting the saddle height. Trying to remove or adjust the saddle with strings under tension can damage the saddle, biscuit, or even the bridge itself. For nut adjustments, loosening or removing strings is essential.

Q3: What does “fret buzz” mean and how is it fixed?

Fret buzz is an unwanted rattling sound that occurs when a vibrating string touches a fret other than the one it’s intended to be fretted on. It’s usually fixed by raising the action slightly, either by raising the saddle, using a taller saddle, or adjusting nut slots if the buzz is on the lower frets.

Q4: Can I use any kind of file to adjust nut slots?

No, it’s best to use specialized nut files designed for guitar nuts and string gauges. Regular files are too aggressive and lack the precision needed, which can easily damage the nut. If you don’t have nut files, consider getting professional help.

Q5: Do I need to worry about adjusting the truss rod for action?

While the truss rod adjusts neck relief (the slight bow in the neck), which does affect action, it’s a more advanced adjustment. For minor action adjustments, focus on the bridge saddle and nut first. If you suspect a neck issue or need to adjust the truss rod, it’s wise to consult a guitar technician.

Q6: How often should I check my guitar’s action?

It’s a good idea to check your action at least a couple of times a year, or whenever you notice a change in how your guitar plays. Seasonal changes in humidity can also affect neck curvature and string height, so monitoring is key.