Motor protection ZMR250 4mm arm NO SCREW NEEDED

Motors protection for ZMR250 4mm arm.

I design this protection to be easy to mount and replace :
- clipsable directly on the arm
- no tool needed
- no screw

If the protection boke on crash, the motor still on the arm, you can replace it directly or still fly without.

I add the key for Cobra 2204 to help taking of/on props. Let me know if it work with other motors, I'll add it on description.