Yosua Wijaya
New Member
Hi Draconomics,Hi Yosua! So when I sand the nut I use a block of wood that I have already sanded level and flat, and attach a square of sandpaper on the top. Then just run the nut back and forth over it. If you go slowly you'll be fine, just keep checking to ensure the nut base is flat. It'll take some time, it took me an hour yesterday to remove about 1.5mm off my new nut. Once I get enough material off, I run the nut over a bastard file to smooth out the cut and fully flatten the base.
Now, do the nut slots need to be filed before putting strings on? Not necessarily. If its a preslotted nut, the only reasons to file the slots is to A: Match fretboard radius and B: To widen the slots to accommodate larger gauge strings. To match fretboard radius, you can buy a radius tool that has a profile of different fretboard radii. I just trace the radii arc onto my nut and just file to match. Something to remember, the difference between the arc length of a typical guitar fretboard radius versus what it would be if flat is very small, but enough to influence how the neck feels quite a bit so you do want to pay some attention to matching fretboard arc. As to string gauges, ideally you want the string to sit in its slot nicely, so a big string in a slot too small may pop out of its slot. Usually nut files are made to match specific string gauges so you dont have to guess, but this also means the nut will be made for a specific string size and may be less effective with other gauges. Again, just go slow, get all the proper tools, check your work constantly and you'll be fine.
Great advice! Now I do know how to sand the nut base. I plan to buy the PRS core nut that is preslotted, do I have to file the nut slot again? Or it's ready to be installed directly? I don't have any tool to check if it's matched with the fretboard radius.