I recently acquired a Cort Curbow five-string in my quest for a lightweight fiver, and when I replaced the strings with flats (personal preference) the difference in tension resulted in far too much "relief;" I need to adjust the truss rod.
Problem is, even when using a magnifying glass, I can't see the end of the recessed truss rod well enough to tell what kind of tool is needed (Old eyes

)
Can anyone tell me which tool to use?
Thanks!