I'm a Stratocaster newbie as of two days. I have a Fender 50's Classic reissue with a gloss maple neck. My question is this: the truss rod access at the headstock is blocked by what looks like a tight-fitting plug of darker wood. The neck heel access is blocked by the pickguard. Am I able to somehow remove the headstock plug, or will I need to de-string and remove the pickguard? This seems illogical as the truss should be adjusted with the guitar strung, surely. I don't actually need to alter the truss, I'm just keen to learn in case I ever need to. Thanks in advance!