Fret leveling, crowning, and hand hammering are critical steps in maintaining or upgrading the playability of a guitar. Here's an overview of these processes: 1. Fret Leveling: This involves ensuring all frets are of uniform height to avoid fret buzz and dead notes. It is done using a leveling file or beam: Mark the fret tops with a marker to see where material is removed. Use a flat leveling tool to sand down the frets evenly. The goal is a perfectly flat plane across all frets. 2. Crowning: Af