i have copy of the steve vai JEM7v, but it has a spring system hadn tremolo unit instread of a floyd rose. it was bought in a time of ignorance and i very soon found out the tremolo was unusable. one push at the whammy bar and the guitr would go out of tune. what i want to know is that can a regular spring tremolo system be used without this trouble? also, can i substitute it with a floyd rose bridge, and what is the cost of floyd rose tremolo bridge in india?