My son just bought an exa-7 7 string kit. Today, we test fitted the neck and ran both the low e and high e strings.

One thing I noticed is that the slots on the nut go about half to three quarters of the was across the nut, but it's not cut all of the way through. So the grooves exist on the fretboard side, but they pretty much disappear on the headstock side.

Am I suppose to buy nut files and extend the groove all the way across the nut?