How to install mighty mite roller guitar nut - Music

Ray's answer is correct.
If you pry the plastic knob straight up off of the tone pot shaft, you should see the retaining nut.
I would usually take the time to open up the plastic cover on the back of the gutar first, to make sure that the wires haven't been twisted around too badly, since the pot has been moving around, to align it to the proper position before re-tightening the nut.

Your Mom's guitar was made in Japan and first produced for schools; however the necks were like telephone poles so they quit making them for awhile and came back out later on. Some later versions were quite good. I would go with the Kelly Bluebook on Acoustic guitars. Thanks!
Guitarpickher -certified guitar tech and all around nuts about loving guitars of all kinds!

Have the guitar setup at a reputable guitar repair shop. This is likely a truss rod setup problem which an inexperienced person should NOT attempt on an expensive guitar. It could also be that the slot in the nut is too low for that string. They can shim the nut if needed or replace it. There are several settings that have to be right to have good playability.

Hi. Your guitar may not be intonated properly. You might want to try to level and balance the height and strings all throughout the neck. The level at the rear half (close to the soundhole) can be slightly higher than the front half (near the headstock). This can be done be adjusting the truss rod, nut and/or saddle.
Note: You may want to get a guitar luthier to do the trussrod, nut and saddle adjustments as these are very delicate procedures.
:-)

The official name of the part the strings run over at the top of the neck before going to the pegs is the "nut". This is the common name for the function on most stringed instruments.

You can buy these at guitar shops and replace your own, but sometimes they have to be adjusted to get the strings at the right height. Take your guitar to a place selling them... they may even be able to quickly change it for you.

I just got two nuts from Guitar Center for a bass and they were less than $5 each.

Sometimes the truss rod (nut you are referring to) will do the trick. The truss rod runs under the fingerboard and allows you to give the neck relief or tension. Some truss rods are dual action but I'm guessing yours is designed simply to give basic relief of the neck. I would make sure the truss rod is adjusted properly before sanding down the saddle. If you sight down the neck you should be able to see the relief in the neck - just use the string as your straight-edge. Most guitars need a slight amount of relief but higher-end guitars can be almost straight (better fretwork.) Once the neck has been adjusted correctly you can move forward with the setup.

Make sure the nut is also the proper height. If the nut is too low (1mm height between bottom of string and first fret) you should get it replaced by someone capable of doing such a thing. If the nut height is okay I would suggest moving forward cautiously by sanding the bottom of the saddle. Make sure this is done patiently and carefully as it can drastically change the sound and playability of the guitar. Hardly any material needs to be taken off to lower the action just a little. Error on the side of not-enough than too much. Make sure the bottom of the saddle remains flat! If the bottom isn't flat the guitar can sound horrible and if there is an undersaddle pickup it might not pick up evenly. The easiest way to do so is to tape some sandpaper rough side up on a flat surface (just don't pick something like mom's heirloom or something important in case it gets scratched.

If you'd like more detail check out http://www.fretnotguitarrepair.com/Repairs2.htm

Good Luck!

Hi ! Must be a problem with either the nut or the g-saddle in the bridge of the guitar.
Good luck , Stefan from Sweden