I've played on several guitars equipped with Floyd Rose, I've noticed that some of these have an entirely loose (free to move) bars (like Van Halen's) , and others are tight. i.e. don't move unless you move them yourself (like Vai's).

Unfortunately mine is Van Halen's loose kind, which I realy hate .

I was wondering if this phenomenon has a name , so that I can search for a model with a tight whamy bar for my guitar.

Thanks !