See my video to see how to break and replace arms on your Eachine Racer 250.
You can buy replacements arms here
http://www.banggood.com/Eachine-Racer-250-RC-Drone-Spare-Part-Frame-Arm-Black-Or-Red-p-1007086.html?p=HM3106075425201208YA
incorporato da Embedded VideoYouTube Direkt
To avoid unsolder ESC from PBD you can leave wires outside the arm.