- Hosco H-ZONE Understring Fret Leveling Tool
- Set of 2 to cover the entire fretboard
- 800-grit diamond abrasive
- 1mm thick stainless steel
- Suitable for use on stainless steel frets
The HOSCO Zone File is a unique tool that allows you to check the fret level while the strings are on and, if necessary, make adjustments with the diamond file on the fly. Four lengths were needed to cover the zone from the low fret to the high fret. For this reason, the Zone files were designed in a trapezoidal shape; two files make one full set.
The name “Zone File” is derived from its unique “Z” shape. It aims to check and adjust a specific “zone” of three adjacent frets. The folded edge of the “Z” is used as a straight edge gauge to check fret height, and the 800 grit diamond file in the center of the “Z” flat surface is used to adjust the fret height.
You can check the fret level while the strings are on! Set the Zone file so that it passes under the strings to be checked. Select a zone file long enough to span the three frets to be checked. Tilt the zone file so that its edges touch the three frets, and check with both hands to see if there is any rocking. If there is no rocking, move the file by one fret and continue the check in the same manner.
You can adjust the fret level with the strings on if you find a high fret. If there is any sagging, it means that the center fret is high. So, set the Zone file so that the diamond file surface touches the fret, and gradually sand the fret to adjust it. Depending on the height reduction of the fret, removing the strings and reshaping the fret crown with a crown file might be necessary.• Suitable for stainless steel fretwire