OMPHOBBY M4 Helicopter Tail Servo Set OSHM4013 Sale! from 5506 /per Qty. Add to Cart This is a replacement swashplate tail servo set for the OMPHOBBY M4 Helicopters Contents Tail Servo-1Ball joint screw-L4.65-1Servo arm-1socket cap screwM2x4-3M2Nylon locknut-1 Qty available:2 SKU:OSHM4013