The Fret Dressing Stick features interchangeable sanding belts. It belongs in your fretting tool kit, for removing the scratches left by leveling and crowning files. File a notch in the end of the stick to conform to the crown of the fretwire, and with the finer-grit belts it becomes a great tool for fret polishing.
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Dan Erlewine's Fretting Series
Complete instruction from fret basics like installation and dressing, through complex refrets and fretting for the production shop.