I have a Czech Spector NS-5CR and recently I can't get the action to go where I want it to. I believe the neck may be beginning to bow as a result of leaving it in a case all of the time. Currently, the only way to set the action is extremely high and it leaves about 1 mm gap from the string to the first fret and a 1/4" gap between the string and frets 12-20 then begins to recede down again. My question is what should I do to fix this? I believe that it may need a truss rod adjustment, but I have never done it before. But I also can't stand the buzzing with low action. I like to play as low as possible and still be clean. Something tells me that if I don't do something quick then I may end up ruining this bass. Thank for you time. On second thought, this may be perfectly acceptable. I was looking through other posts and found the attached picture, which is what my current setup looks like. But I still want the advice of someone who knows more than me about this. This is the first moderately expensive bass that I have owned.