Hi! I just got a new fender bass (pics soon) The bass came with a badass bridge installed, but the seller included the original bridge. I want to install the original frist, and them when im used to the stock bass try and change it. So how do i change it? just un-screw the bridge and screw the new one? or the is something else i should know??? Also, how can i tell if it is a badass I or II ??? Thanks!