Refretting Procedure Including Fret Slot Milling, Tang Preparation, and Crown Smoothing Steps

Refret when frets dip below 0.3 mm or notches hinder playability, then mill slots to a precise 1/32” depth for secure fitment. Prepare tangs by cleaning, beveling to 60–70°, and lubricating to guarantee full seating. Tap frets in snugly with a setter, level with a 24” beam and 320-grit paper, then crown with a diamond file. Smooth progressions with 320–2000-grit paper and polish to a mirror shine-you’ll soon see how each step impacts tone and playability.

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Notable Insights

• Mill fret slots to 1/32” depth with a chamfered edge, ensuring straight, debris-free channels for precise fret seating.
• Prepare fret tangs by scraping old glue, beveling shoulders to 60–70°, and lubricating for smooth, secure insertion.
• Install frets using a fret setter, confirming full tang seating without glue and avoiding damage from excessive force.
• Level high frets with a straightedge and 320-grit sandpaper, then crown each fret to a rounded peak using a diamond file.
• Smooth and polish frets by sanding progressively to 2000-grit, beveling ends at 15°, and buffing to a mirror finish.

When to Refret vs. Level Your Guitar

While you might be tempted to jump straight into a refret when your guitar starts feeling rough, it’s worth checking whether a simpler fret level and crown could do the job-especially if your frets still have at least 0.5 mm of height and are evenly seated, since that gives a tech enough material to level, recrown, and smooth out buzzing without weakening the frets. If your frets are worn below 0.3 mm or have deep notches, though, a refret job is necessary. Rising fret ends from fretboard shrinkage, damaged fret slots, or corroded fret tangs also demand full replacement. Leveling high frets works temporarily if they’re just proud, but recurring issues mean poor seating. You’ll need new fret wire when changing size or fretboard radius. Always adjust the truss rod first to create a level surface. A skilled tech uses a fret crowning file to restore each crown’s rounded shape after leveling, ensuring clean attacks and clear tone.

Prepare Fret Tangs for a Secure Refret

Your fret tangs’ condition makes or breaks a refret’s longevity, so start by scraping off old glue and gunk with a hook tool or precision blade-any leftover debris means poor slot contact and a loose fit. Inspect each fret tang closely; if it’s bent or damaged, it won’t seat fully in the fret slot, weakening hold. Use a small file, preferably a three corner type, to bevel the tang shoulders to 60–70°, matching standard slot angles so they slide in easier without forcing. You’ll need to remove material evenly to guarantee a 1/32″ depth past the fretboard surface, allowing full seating under pressure. Don’t skip lubricating the tangs-light soap or fretting wax reduces friction and keeps the wood from splitting. This prep guarantees each fret stays put when you finally tighten the rod nut and apply wood glue.

Install, Level, and Crown Your New Frets

Now that your fret tangs are cleaned, beveled, and ready for installation, it’s time to set them into the slots with precision. Use a fret setter to tap each fret into the 1/32” deep, chamfered slots, guaranteeing full contact and a snug fit-don’t use wood glue, as it can hinder future repairs. Once all frets are installed, level them with a 24” straightedge and 320-grit sandpaper on a leveling beam, removing high spots marked with green Sharpie. This guarantees the top of fret height is uniform across the fingerboard. After leveling, crown each fret using a StewMac medium diamond file, creating a smooth, rounded peak aligned with the slot. Then, sand the fret tops with 320, 600, 1200, and 2000-grit wet/dry paper to eliminate file marks. Be careful not to sand into the wood or damage fret ends during this stage.

Polish Frets and Fret Ends for a Pro Finish

Every detail matters when it comes to achieving a professional fret finish, and polishing is where your patience pays off with glass-smooth playability. Start by using wet/dry sandpaper-soak 320, 600, 1200, and 2000 grit paper overnight, then sand each fret end to end to remove scratches. Follow with a 1200-grit sanding sock to flap-sand fret edges, eliminating burrs. Bevel the fret ends with a precision beveling file at a consistent 15-degree angle for seamless contact with the fingerboard edge. Then, polish each crown using a Dremel, buffing wheel, and jeweler’s rouge until you achieve a mirror-like finish. Wipe clean with lighter fluid to reveal a flawless, reflective surface.

On a final note

You’ve leveled, crowned, and polished-now your frets feel smooth and even, with precise 2.2mm crown heights and zero sharp edges. Proper tang fit guarantees no buzzing or lifting, even after heavy playing. A 600-grit finish gives pro slickness without over-polishing. Real testers report faster bends and clearer sustain. For recording or live work, well-finished frets mean cleaner signal tracking. Keep tools clean, measure twice, and your refret lasts years. Job done right, it plays right.