Keyestudio 4DOF Manual page 41

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(3) Completed the above assembly, move on to the Right Arm Servo Plate.
 M3*12MM round-head screw *2
 M3 hex lock nut *2
 M2x5MM Phillips tapping screw *1
 M2x8MM Phillips tapping screw *1
 Black 180° servo *1
 White servo mount *1
 Black Acrylic plate *5