What size wrench for truss rod nut on AR372?

[seafoamgreenery]

I just got an AR372CE and discovered that the truss rod ends in a nut. This is a new one for me — I'm used the sort you adjust using an allen wrench. 

What's the size wrench I need to adjust? Seems like 7mm or 8mm are common, though StewMac sells 1/4", 9/32", and 5/16". 

Any other tips for adjusting this sort of truss rod would be appreciated — thanks.

[seafoamgreenery]

Got a reply from Eastman: use a 5/16" wrench. 

5/16" = 7.9mm, so you could try an 8mm wrench if you've already got one.

[Zeiss]

Sea foam you should change your avatar? its not right handed but you can use it ? Lol

[seafoamgreenery]

What a great color!

[Zeiss]

I'm glad you like
I was told it's not actually Sea Foam green but the color of bill collings vintage pickup truck he had in the lobby of his factory . I bought it new and the pics didn't do it justice . I was so taken when I opened the case , it was wow ! Then I turned it up and plugged it in , another WOW ! LOL