I went to play my MM Sabre today, and found the neck way too straight. I loosened the truss rod 1/4th turn and had a little better of a situation, but the neck was still to straight. another turn, and i found the nut or whatever part you stick the allen wrench into to be loose. So i have the problem of not being able to loosen my truss rod anymore without the thing just coming off the truss rod. I wish i knew what that part was called. Can someone explain to me how to remedy this?