RE: 12X Throttle-rattle.
Did you follow the manual to adjust the rudder tension? If so, that is what's causing the rattling sound.
The problem is... the manual incorrectly states where to find the rudder and throttle tension. The real throttle tension adjustment can be found underneath the rubber stopper located at the lower right corner of the module slot (just above the battery door). The adjustment screw found at the upper-right end seems to be the actual rudder tension adjustment.
Hope this helps.