Step-by-step professional setup walkthrough — electric, bass & acoustic
Fret condition is the single biggest factor determining how low a setup can go. Work through these checks before adjusting action — there is no point optimising saddle height over worn or uneven frets.
Step 1 — Visual inspection
Step 2 — Fret rocker test
A fret rocker is a small precision straightedge that spans exactly three frets. Any rocking motion indicates the middle fret is high relative to its neighbours.
Step 3 — Wear assessment
What does this mean for your setup?
No high frets, minimal wear, no flat spots. Your setup can achieve the lowest action your playing style allows.
Some isolated high frets or light wear. A full setup can still improve playability, but you may not achieve the very lowest action. Note the problem frets and work around them. Consider a fret level at the next service.
Widespread wear, grooves, multiple high frets, or flat-topped frets. A setup will give limited results. The frets should be addressed first — see the guidance below.
Fret work options
DIY fret levelling: A fret level, crown and polish is achievable by a careful DIYer with the right tools — a levelling beam, crowning file, fret rocker, and plenty of patience. However, on a valuable guitar or a bound fretboard, professional work is strongly recommended. A poorly executed level can remove too much fret height and necessitate a full refret.
Fret height reference
Brand / model presets
Select a preset to load that manufacturer's factory starting specs. Use as a baseline — adjust to suit your playing style.