Modulus Truss Rod Issue

[Sean R]

I have a Q6 that I need to tweak the neck slightly - problem is, I can't figure out the truss rod size. Looks to be a allen wrench, but even a 6mm is too small and I can't really see into it very well. Any ideas here?

Thank you much for looking.
Sean

 

[JoeJeffries.com]

I believe that it's 5mm.

 

[Sean R]

Indeed. It is 5mm. The bolt was way up in there so seemed that the hole for it was much larger. Appreciate the reply