Alwarerc Senrigan GP-55 3-Axis Brushless Gimbal V2 With Bluetooth (For 600 -1000 Size Multicopter) - Manual (Page 9)

M2.5x6mm Phillip Flat Screw
Use M3x5mm screw only, screw longer
then 5mm will damaged the motor! Use M3x5mm screw only, screw longer
then 5mm will damaged the motor!
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