High Quality Servo Single Standard Arm for JR 2

A single standard-length servo arm for JR-type servos. Standard length is the general-purpose choice: long enough to give useful travel and mechanical advantage without the leverage of a long arm loading the servo gear train harder.

The arm is the interface between the servo and the pushrod, so its length and its hole spacing set the mechanical advantage of the whole linkage. A longer arm gives more travel at the surface for the same servo rotation but reduces the torque available at the surface.

Check the spline and the hole spacing suit your servo and linkage.