I read many articles and saw a couple of videos on how to setup the neck relief. I think I understand the theory, but the practice is something else. I tried to sight it, but when I see down the bass I dont see anything wrong. There also the credit card trick but I still dont get it. Maybe they are not explaining it right. The other setup steps I think I have them down (string height, intonation, pickup height) Could somebody give me some pointers on how to setup the neck?