My dad crashed his DJI Mini 4K for the first time. At first we thought the drone came out of the crash unharmed until we folded the arms as we were getting ready to put it back in its case. I noticed that one of the arms was a bit resistant when I tried folding it in, then I noticed the small crack shown in the picture.
My dad said that if we can just find the
part he can just screw it on himself. Does anyone know what this part is called. It's not the arm, it's the part that attaches to the arm and i don't know what to call it

Hello there. We recommend sending the device back to us through our official website. This will allow our certified technicians to conduct a comprehensive inspection of the aircraft.
Path: Visit the DJI official website > Support > Click "Request Now" under "Request Repair Service Online" > Select "Repair Application Submission" and complete the form.