RE: 12X Throttle-rattle.
Correction to my last, have just opened up a DSX12 to source a similar rattle. The throttle stick is fully screwed down so it's not likely to be that.
The antenna has a metal shroud at the tip that forms the half wave dipole antenna. Tap the antenna end to see if that is the cause of the rattle. If so, then I wouldn't worry about it.