I just purchased a Tremonti SE Custom, and the top piece of the trem (where the trem arm goes), the set screw is not threading. I took the guitar to my tech, and he also can't get the set screw that came with the guitar to thread. The screw goes about halfway in and then stops tightening. I'm not sure if it was defective when I bought it or what. Does anyone know if its possible to purchase just this top piece? I am really bummed if I can't use the tremolo. Thanks for any answers!