If you're building an add-on for a non-toy UAV, you can make sure you've done your homework and won't be blamed for making a broken part that could fall out of the UAV leads from the sky and hits someone on the head (and causes head injuries). . In short, when the two screws holding the cover strip in place (the screws are cheap aluminum), the entire prop comes loose and your drone loses control, while its wobbling destroys the cheap components of the other props as well. Once your DJI Mini 2 rolls onto its side, it will shut down and begin to fall freely. Additional info: * The screws were not over tightened and I used blue Loctite for extra protection. * The propellers were checked before each flight. that they were cocked and ready to fly.* You can literally see on the covers where the aluminum was in chips. So my advice to the manufacturer, hire a lawyer.