Fret leveling with strings on - RECTIFY Master - fret leveling with strings on

DIY Fret Leveling

Refretting + neck and truss-rod correction

RECTIFY/Master Pyramids - the fretboard and tool gauges

Katana Fret Levelling System Video Overview

DIY Fret Leveling

Understring Fret Crowning File

How does the action (distance between fret and string) of a guitar affect the tone/sound/timbre? - Quora

Strings On - The Katana Fret Leveling System by RECTIFY Master.

Five Factors That Make a Good Guitar Nut - zZounds Music Blog

The Programmable Synthesized Guitar

Levelling Frets [Archive] - Pit Bull Guitar Forums

DIY Fret Leveling