7 mm hex wrench.

I used to watch my friend adjust mine with a straight edge down the neck. Is there a certain spec? I'd like to start doing my own set-ups

First of all --- assuming it is the method that I am thinking of --- using a straight edge to adjust a neck assumes that all frets are perfectly level.


Now, as to a 'standard' setting, there isn't one. It is a playing preference. And changing one changes the other. So when you alter your truss, your action changes, so you need to alter it --- it also changes your intonation. And if you are on something like a Floyd, then you need to readjust your springs.
It can be an adventure trying to find 'just the right' setting for you.
*I suggest trying it on something like a Les Paul first. At least that way you don't have to worry about the tremolo issues.


HOWEVER, there are some numbers that have been tried over the last few centuries and are a good starting point.

1. Hold down the low E string at the first fret.
2. Hold down the low E string at --- it varies based on guitar --- at the 16th fret.

3. Take the part of your high E string that you clipped off after the tuner, and see if there is enough clearance between the string and fret at the 8th fret (again, it varies based on where you are doing #2).

You should be able to take that string and move it freely in the space.


*It doesn't matter what gauge you use, because different gauges require different settings. So, the adjustment is still a good starting point.
*If you have a 7 string guitar, use the two B stings instead of the two E strings.
*Again, this is just a starting point. Adjustments for gauge, playing style, and other personal preferences are required.

Hey, I have Charvel Fusion Plus '89, is it 7mm hex wrench too?

Yes

Sorry for the delayed response... THANKS!!

Thanks Pianoguy.