I just got a mexican standard strat from musiciansfriend. Now, when i bend a string, the metal thingy at the base of the guitar (er...the bridge i think) moves - this causes the other strings to bend. So if i wanna play two notes together (on two strings) and bend one of them, i end up bending both! Is this is a defect?? Is the bridge supposed to move when a string is bent?How can i fix it? Should i return ? Please help!