yeah, those anti drop screws, those black plastic things that go through the dampeners to keep the whole thing together from popping off. every now and then i lose an anti drop screw when returning from a flight. the replacement set that DJI has sells for $39. **** expensive for items that are cheap plastic and loosen during flight. do you guys use thread locker to keep them in place? the one that I keep loosing id the one that it underneath the body. i assume the disk portion is held in place and the vibration slowly backs the plastic screw out in flight. what are you experiences or fixes?