I just got a new Fender American Jazz bass and I need to take a little relief out of the neck with a clockwise turn to the truss rod. My problem is that it won't turn either way, and I don't want to apply excessive force. I've done PLENTY of guitar set-ups with no problems, but I'm new to bass. I've read that you should loosen the strings first, which I did. Maybe not enough? Anyway, it won't turn counter-clockwise either. Is lubrication called for? Are bass rods just a whole lot tougher than guitar rods? Any ideas would be greatly appreciated. Thx!