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Aluminum Large Double Servo Arm for Futaba ServosOverall length 3.8". Drilled for control radius of 1.737" (44.13mm), 1.5" (38mm) and 1.25" (36.75mm). Threaded for 3mm fasteners. Your ball joints made for 3mm or 4-40 bolts through the balls can be installed on this servo arm with 3mm fasteners. Horn fits on splines then clamps with tightening of two fasteners requiring a 2mm socket head wrench. No horn to spline slop is possible with this horn.
SKU Number: RRCAA3.5FJ