How to save a graphite nut

Here we have an LTD EX-50,an affordable first guitar for the metal guitarist,in for a setup. This guitar has an additional problem. With ideal relief on the neck and ideal action at the bridge,we have buzzing on our open low E string. Because it's only on the open string,we know it's because our nut slot has worn too low. The "correct" solution is to replace the nut. The owner of this guitar is a teenager who can afford a setup,not a setup and a new nut. Our answer will have to be the "good enough" solution. We'll need some superglue,glue accelerator and some graphite powder. You can get the powder from the hardware store but I prefer to use stubby old leftover pencils (reduce,reuse,recycle!).  I fold up an old string package and break of a bit of pencil graphite. I use my fretting hammer to turn it into powder. A little drop of super glue accelerator,before the graphite,helps it dry from the bottom up,preventing spills. The fold in the string package works like a funnel to guide the powder into the nut slot. For accuracy,I use the plastic toothpicks from Stewart MacDonald to guide the super glue. From here,it's just a matter of filing the nut slot to the desired depth. Keep in mind this is a "just for now" kind of repair that was done as a stop gap measure until we can do it "right". I did this additional work for free,because I think it was more important to have a working guitar in the hands of a player. More guitar players = a better world!

Use a ruler to slide protective tape under the strings.

Bang bang.