I am currently doing an overhaul on a ~1960's Kingston guitar. I'm attempting to straighten the neck but after removing the truss rod cover and the neck from the body I've discovered something a bit unusual. The truss rod at the headstock end does not seem to be easily adjusted. The space between the nut and the cavity is about 7/8". This is not enough space for a typical Gibson style wrench in either straight or right angle sizes. At the body end of the neck, there is a bolt which measures ~9mm. I'm confident I can adjust this with a 9mm wrench but I'm unsure if the design of the truss rod would allow for such an adjustment. I'm thinking of cutting down a 5/16" socket and threading a rod through it to make my own right angle wrench for the truss rod at the headstock end. Before I do that I was wondering if it would be alright to adjust the truss rod at the body end? I've provided some pictures and would appreciate the help. If you have any other questions please feel free to ask.