Last X-mas I got a Dean guitar, FBD Dimebag tribute ML. I've stretched the strings and play all the time. But whenever I use the whammy bar, all the strings go out of tune. I went to a guitar store, but those idiots were no help. How do I prevent my guitar from going out of tune when I use the bar?
Check to see if you nut locks work fine and make sure the strings are locked ok. If the problem still persists you need to adjust your trem springs. Most probably they're just off balance. The tension on both sides needs to be matched. If that does'nt fix the problem either, you need new springs. I've known guys to change one or two springs and leave a third one old. No can do. Got to replace all at the same time. Like jocelyn says, take it to someone