Hello forum, I recently got an ESP LTD MH-401QM from a friend of mine, he bought it 3 years ago but it hasn't been played a lot, so I replaced the strings and tried setting it up, but when I got to the truss rod adjustment I encountered a problem, the neck was having a backbow I tried loosening the truss rod and got to a point when it feels really loose, so i didn't go any further.I read that ESP/LTDs usually come with a double action truss rod and if that's the case could this be something like a neutral position and if I am to continue turning it will go in the other direction or I shouldn't try to loosen it any further?