A shop setup runs sixty to a hundred dollars, and most of what you're paying for is forty minutes of work you could do yourself. Not all of it—truss rod adjustments and fret leveling—deserves a professional until you've done a few—but string height, nut slots, fret ends, and hardware polish are all well within reach. The catch is that a guitar is a tolerance stack: every one of those adjustments affects the others, and the order you do them in is most of the skill.
What you will learn
- The order adjustments have to happen in, and why
- Which jobs are safe at home and which belong in a shop
- How to polish frets and hardware without damaging a finish
- What to do about a nut slot that's too tight or too low
- How to measure setup so you're not guessing
Why does the order matter so much?
Because each step changes the geometry the next one measures. The correct sequence is relief first, then nut height, then saddle height, then intonation. If you set your action before the relief is right, you'll set it again after the neck settles. If you set intonation last—which you should—it's the only step that doesn't get invalidated by anything after it. People skip relief because the truss rod is intimidating, and then they chase a buzzing fret by raising the saddle, which makes the guitar harder to play while fixing nothing. Relief is a quarter-turn at a time, measured with a feeler gauge at the seventh fret with the string fretted at the first and the last. A quarter turn, then wait an hour. Necks take time to move.
What's safe at home and what isn't?
Safe: saddle height, intonation, cleaning and polishing frets and hardware, easing sharp fret ends, minor nut slot widening, and tightening loose hardware. Not safe on your first few: fret leveling and crowning, refretting, nut replacement from blank, anything involving a heat-treated neck, and any adjustment on a valuable vintage instrument where originality is the value. There's also a category of "safe but "irreversible"—filing a nut slot lower cannot be undone except by replacing the nut. File the sides of a slot if it's tight; file the floor only when you're certain. I keep a Grey Pro 80-piece cordless system on the bench for fret and hardware work because the cordless body is easier to control around a body than a corded one.
How do you polish frets properly?
Mask the fretboard first, thoroughly, with low-tack tape, and leave the fret itself exposed. Polishing compound gets into everything, and it will lighten rosewood or ebony. Work along the fret, not across it, and use a fine abrasive followed by a felt bob with metal polish. The transformation on a guitar that hasn't been touched in years is dramatic—oxidized nickel goes from grey to bright, and bending strings stops feeling like sandpaper. Two warnings: don't dwell, because heat travels into the fret and can loosen it in the slot, and don't let an abrasive touch the fretboard through a gap in your masking. On a lacquered maple board the masking matters even more, because you can burn through the finish in seconds.
What about sharp fret ends?
Seasonal, and usually fixable in fifteen minutes. Wood shrinks in dry winter air, the fret ends protrude past the board edge, and your hand catches on them. The proper fix is a fret end file used at a slight angle, working the end back until it's flush and rounded. In a pinch, a fine abrasive on a small drum at low speed, held at an angle and barely touching, gets the same result—but it's easy to take off too much and leave a rounded lump that looks wrong. Mask the board edge. Check your work by running a finger along the edge rather than looking at it, because the visual difference is tiny and the tactile difference isn't.
How do you deal with problem nut slots?
Diagnose which problem you have before you touch a file. A string that sticks and makes a ping when you tune is a slot that's too tight—the fix is widening the sides slightly, and lubrication with graphite from a pencil lead usually solves it entirely without removing material. A string that buzzes open but not fretted is a slot that's too low, and that's not fixable by filing; it needs a shim or a new nut. A string that's hard to press at the first fret is the same problem from the player's side. Nut files are the right tool, and they're not expensive for a basic set, and for the surrounding work—easing a sharp fret end, dressing a rough slot mouth—a small set like the Black Essential 61-piece kit covers the fine bits without tempting you into anything aggressive. A rotary tool in a nut slot is a blunt instrument—it removes material from the floor as easily as the sides—and I'd only reach for it if I were cutting a new slot from scratch.
How do you measure instead of guessing?
With a caliper and a set of feeler gauges, both of which cost less than one shop setup. String height gets measured at the twelfth fret from the top of the fret to the bottom of the string—around 1.5 to 2 mm on the treble side and a touch more on the bass for an electric, more for acoustic. Pickup height is measured from the pole piece to the string with the string fretted at the last fret. String spacing at the nut is easiest to read off directly with a caliper, and it's the number people get wrong when they replace a nut, because "looks evenly spaced" is not evenly spaced. A 6-inch digital caliper handles all of it, and it's small enough to keep in a case pocket. Write the numbers down. The point of measuring is that next year you can tell whether something moved.
Is hardware polish worth doing?
On an older guitar with tarnished tuners, a bridge, and a set of pickup covers, yes—it's the single biggest visual improvement per minute spent. Take the hardware off the instrument first if you can. Polishing parts in place means compound in the threads, in the pickup cavities, and around the finish edges. If you can't remove it, mask generously. Gold-plated hardware is the exception: the plating is thin, and aggressive polishing will cut straight through it to the base metal. On gold, a wipe with a clean cloth is all it should ever get.
What's a realistic first-time timeline?
Two sessions. Session one is measurement and relief—forty minutes of measuring, a quarter turn, and then you walk away for an hour because necks move slowly. Session two is saddle height, intonation, and any polishing, which is another ninety minutes. The reason to split it is that the second session benefits from the neck having settled, and rushing relief is the most common reason a home setup ends up worse than the starting point.
From the workshop: the Strat I made was unplayable.
Bought a 1994 Strat for $180 at a pawn shop with terrible action. I went straight for the saddles, dropped them, and it still buzzed on the low E. So I dropped them further. Still buzzed. By the third attempt the strings were so low they choked out on any bend past a whole step, and I'd spent two hours making a playable guitar worse. The problem was never the saddle—the neck had almost no relief, and the first fret was doing the buzzing. Quarter turn on the rod, wait an hour, and the buzz is gone at the original saddle height. I'd have found it in five minutes if I'd measured relief first. That guitar taught me the sequence, and I've done it in the same order on every instrument since.
Common mistakes recap
- Setting saddle height before setting relief
- Turning the truss rod more than a quarter turn at a time
- Filing the floor of a nut slot to fix a tight string
- Polishing hardware in place and getting compound in the threads
- Polishing gold-plated parts aggressively
- Adjusting by feel instead of measuring and writing it down
FAQ
Can I adjust the truss rod on an acoustic?
Yes, same quarter-turn rule. Acoustics are less forgiving of low action because there's no way to raise the saddle much, so don't over-correct.
Why does it still buzz after I raised the action?
Probably relief, or one high fret. Check relief first, then rock a short straightedge across three frets at a time to find a high one.
How often should a setup be done?
Twice a year if the instrument lives in a house with seasons, and after any string gauge change. A heavier gauge pulls harder and changes relief.
Is polishing frets going to wear them out?
Not meaningfully at the frequency you'd do it. Polishing removes oxidation, not metal, as long as you use a fine abrasive and polish rather than sanding.
What's the right string height?
Around 1.5 to 2 mm at the twelfth fret on the treble side for electric, a little more for acoustic. It's a starting point, not a rule—players vary.
Can I fix a nut with superglue and baking soda?
You can, and it works as a temporary shim for a slot cut too low. It's not a permanent repair, and the repair itself files differently from bone or tusq, which makes future work harder.
Should I take the strings off to polish?
Yes for hardware, and slacken them and push them aside for fretwork. Working around tensioned strings is how you slip and cut a string you didn't need to replace.
Does a setup change the tone?
Pickup height does, noticeably. Action mostly affects playability and sustain. If you're chasing tone, measure and adjust pickup height rather than the bridge.
