Fret Slots Too Wide: Fixes & Luthier Tips List 2026

Fret slots too wide plague guitar builders, causing buzz and intonation woes. This 2026 list details causes, tools, and precise fixes for perfect frets.

Common Causes of Wide Slots

Over-sanding or poor nut files.

  • Incorrect file width
  • Excessive depth filing
  • Humidity wood swell

Essential Tools Needed

Precision gear is key.

  • Diamond fret files
  • Slot width gauge
  • CA glue syringes

Step-by-Step Narrowing Method

Fill and re-slot carefully.

  • Clean slot
  • Mix baking soda + superglue
  • Refile to spec (0.020"-0.040")

Alternative: Epoxy Fill Technique

For severe cases.

  • Two-part epoxy
  • Powdered ebony filler
  • 24hr cure time

Pro Prevention Tips

Avoid future issues.

  • Pre-measure fret wire
  • Use guided files
  • Test with feeler gauges

When to Seek Luthier Help

Know your limits.

  • Nut replacement needed
  • Fretboard damage
  • Vintage instruments

Related Topics