what tool for truss rod adjustment on Hallmark C60?

[Hydra19]

Iv'e put on some 9's on my hallmark and it's great but buzzing slightly up to the 6-7 fret so I assume I might need to add a tiny bit of relief. Does it take an allen wrench? I don't have any spare strings so I'm not going to take the strings off tonight and I can't get inside by simply unscrewing the pickup ring. I'll get some new strings and have a look but I just need to know if I need anything special or if there's an easier way to reach it? Thanks...

[Bob Shade]

Pop the neck pickup, bring the strings back to pitch, adjust rod with allen wrench, slide pickup back in place.

Bob