Remove the old saddle from your guitar. Place it on the name and mark the length of the old saddle on the subject. If you want the new saddle to be the same height as the old one, mark the height on the plot as well.
Clamp the blank in place and cut it with the hacksaw to approximately the same length and length as you want, which gives a small margin for grinding and shaping.
Squeeze the sandpaper on an even surface and place the saddle on it. Use your fingers to give continuous pressure, rubbing the substance back and forth on sandpaper to level it evenly. When the gloss is quite flat, start trying to fit it in the chin of the guitar. Continue rubbing it on sandpaper until it is just thin enough to fit in your chin. If the saddle becomes too thin, you will need to start over.
Round off the corner of the tom on sandpaper. Mark the ends as treble and bass.
Rub the saddle on sandpaper again, this time to smooth it upside down. When it is level with the pencil trace or mark you made earlier, round the edges down a little more for a rounded edge.
Put the finished saddle back in the chin and pull the guitar together.
Tips and warnings
A guitar saddle is a thin strip of bone, ivory or plastic, which is placed right in front of the bridge pegs on acoustic guitars. According to Fret Not Guitar Repair, the saddle and its placement affect three things: string length and intonation, string effect (height) and tone. The tone, in particular, can vary depending on the material used to make the saddle. This article is about making a saddle out of bone, considered by guitar maker Frank Ford as the best material to get a rich tone.