so I am noticing on my Fender Jazz that a couple of my tuners that there is space between the base of the tuner and the back of the headstock. I am talking about the square that attaches the tuner to the back of the headstock, with the 4 screws in it. I have tried to tighten the screws, but unfortunately it seems that those a couple of the screw holes have lost their threading, as they will not stay tightened. Is this a big problem? I was planning to replace the pickups soon, but I don't want to if I am going to need to replace the neck?